diff --git a/android/assets/jsons/Policies.json b/android/assets/jsons/Policies.json
index 4ab5b1ec19..f0414d75eb 100644
--- a/android/assets/jsons/Policies.json
+++ b/android/assets/jsons/Policies.json
@@ -1,7 +1,7 @@
 [
 	{
 		"name": "Tradition",
-		"era": "Ancient",
+		"era": "Ancient era",
 		"effect": "+3 culture in capital and increased rate of border expansion",
 		"policies": [
 			{
@@ -44,7 +44,7 @@
 	},
 	{
 		"name": "Liberty",
-		"era": "Ancient",
+		"era": "Ancient era",
 		"effect": "+1 culture in every city",
 		"policies": [
 			{
@@ -88,7 +88,7 @@
 	},
 	{
 		"name": "Honor",
-		"era": "Ancient",
+		"era": "Ancient era",
 		"effect": "+25% bonus vs Barbarians; gain Culture when you kill a barbarian unit",
 		"policies": [
 			{
@@ -131,7 +131,7 @@
 		]
 	},{
 		"name": "Piety",
-		"era": "Classical",
+		"era": "Classical era",
 		"effect": "Building time of culture buildings reduced by 15%",
 		"policies": [
 			{
@@ -174,7 +174,7 @@
 		]
 	},/*{
 		"name": "Patronage",
-		"era": "Classical",
+		"era": "Classical era",
 		"effect": "Influence with City-States degrades 25% slower than normal",
 		"policies": [
 			{
@@ -219,7 +219,7 @@
 	{
 		"name": "Commerce",
 		"effect": "+25% gold in capital",
-		"era": "Medieval",
+		"era": "Medieval era",
 		"policies": [
 			{
 				"name": "Trade Unions",
@@ -262,7 +262,7 @@
 	},
 	{
 		"name": "Rationalism",
-		"era": "Renaissance",
+		"era": "Renaissance era",
 		"effect": "Production to science conversion in cities increased by 33%",
 		"policies": [
 			{
@@ -306,7 +306,7 @@
 	},
 	/*{
 		"name": "Order",
-		"era": "Industrial",
+		"era": "Industrial era",
 		"effect": "+1 Happiness per City",
 		"policies": [
 			{
@@ -349,7 +349,7 @@
 	},*/
 	{
 		"name": "Freedom",
-		"era": "Renaissance",
+		"era": "Renaissance era",
 		"effect": "+25% great people rate",
 		"policies": [
 			{
@@ -392,7 +392,7 @@
 	},
 	{
 		"name": "Autocracy",
-		"era": "Industrial",
+		"era": "Industrial era",
 		"effect": "-33% unit upkeep costs",
 		"policies": [
 			{
diff --git a/android/assets/jsons/Techs.json b/android/assets/jsons/Techs.json
index b02734f93a..25608e4428 100644
--- a/android/assets/jsons/Techs.json
+++ b/android/assets/jsons/Techs.json
@@ -1,7 +1,7 @@
 [
 	{
 		"columnNumber": 0,
-		"era": "Ancient",
+		"era": "Ancient era",
 		"techCost": 20,
 		"buildingCost": 40,
 		"techs": [
@@ -15,7 +15,7 @@
 	},
 	{
 		"columnNumber": 1,
-		"era": "Ancient",
+		"era": "Ancient era",
 		"techCost": 35, 
 		"buildingCost": 60,
 		"techs": [
@@ -48,7 +48,7 @@
 	},
 	{
 		"columnNumber": 2,
-		"era": "Ancient",
+		"era": "Ancient era",
 		"techCost": 55, 
 		"buildingCost": 75,
 		"wonderCost": 185,
@@ -99,7 +99,7 @@
 	},
 	{
 		"columnNumber": 3,
-		"era": "Classical",
+		"era": "Classical era",
 		"techCost": 105, 
 		"buildingCost": 100,
 		"wonderCost": 250,
@@ -134,7 +134,7 @@
 	},
 	{
 		"columnNumber": 4,
-		"era": "Classical",
+		"era": "Classical era",
 		"techCost": 175, 
 		"buildingCost": 120,
 		"wonderCost": 300,
@@ -167,7 +167,7 @@
 	},
 	{
 		"columnNumber": 5,
-		"era": "Medieval",
+		"era": "Medieval era",
 		"techCost": 275,
 		"buildingCost": 160,
 		"wonderCost": 400,
@@ -202,7 +202,7 @@
 	},
 	{
 		"columnNumber": 6,
-		"era": "Medieval",
+		"era": "Medieval era",
 		"techCost": 485, 
 		"buildingCost": 200,
 		"wonderCost": 500,
@@ -250,7 +250,7 @@
 	},
 	{
 		"columnNumber": 7,
-		"era": "Renaissance",
+		"era": "Renaissance era",
 		"techCost": 780, 
 		"buildingCost": 250,
 		"wonderCost": 625,
@@ -290,7 +290,7 @@
 	},
 	{
 		"columnNumber": 8,
-		"era": "Renaissance",
+		"era": "Renaissance era",
 		"techCost": 1150, 
 		"buildingCost": 300,
 		"wonderCost": 750,
@@ -329,7 +329,7 @@
 	},
 	{
 		"columnNumber": 9,
-		"era": "Industrial",
+		"era": "Industrial era",
 		"techCost": 1600,
 		"buildingCost": 360,
 		"wonderCost": 920,
@@ -374,7 +374,7 @@
 	},
 	{
 		"columnNumber": 10,
-		"era": "Industrial",
+		"era": "Industrial era",
 		"techCost": 2350,
 		"buildingCost": 500,
 		"wonderCost": 1060,
@@ -408,7 +408,7 @@
 	},
 	{
 		"columnNumber": 11,
-		"era": "Modern",
+		"era": "Modern era",
 		"techCost": 3100,
 		"buildingCost": 500,
 		"wonderCost": 1250,
@@ -447,7 +447,7 @@
 	},
 	{
 		"columnNumber": 12,
-		"era": "Modern",
+		"era": "Modern era",
 		"techCost": 4100,
 		"buildingCost": 500,
 		"wonderCost": 1250,
@@ -480,7 +480,7 @@
 	},
 	{
 		"columnNumber": 13,
-		"era": "Information",
+		"era": "Information era",
 		"techCost": 5100,
 		"buildingCost": 500,
 		"wonderCost": 1250,
@@ -513,7 +513,7 @@
 	},
 	{
 		"columnNumber": 14,
-		"era": "Information",
+		"era": "Information era",
 		"techCost": 6400,
 		"buildingCost": 750,
 		"wonderCost": 2000,
@@ -547,7 +547,7 @@
 	},
 	{
 		"columnNumber": 15,
-		"era": "Future",
+		"era": "Future era",
 		"techCost": 7700,
 		"buildingCost": 750,
 		"wonderCost": 1250,
@@ -581,7 +581,7 @@
 	
 	{
 		"columnNumber": 16,
-		"era": "Future",
+		"era": "Future era",
 		"techCost": 8800,
 		"buildingCost": 750,
 		"wonderCost": 1250,
@@ -602,7 +602,7 @@
 	},
 	{
 		"columnNumber": 17,
-		"era": "Future",
+		"era": "Future era",
 		"techCost": 9500,
 		"buildingCost": 750,
 		"wonderCost": 1250,
diff --git a/core/src/com/unciv/Constants.kt b/core/src/com/unciv/Constants.kt
index d79e067282..6037119483 100644
--- a/core/src/com/unciv/Constants.kt
+++ b/core/src/com/unciv/Constants.kt
@@ -63,4 +63,7 @@ object Constants {
     const val close = "Close"
 
     const val scienceConversionEffect = "Production to science conversion in cities increased by 33%"
+
+    const val ancientEra="Ancient era"
+    const val futureEra="Future era"
 }
\ No newline at end of file
diff --git a/core/src/com/unciv/logic/battle/MapUnitCombatant.kt b/core/src/com/unciv/logic/battle/MapUnitCombatant.kt
index 38b4ee7960..57e4be5d7e 100644
--- a/core/src/com/unciv/logic/battle/MapUnitCombatant.kt
+++ b/core/src/com/unciv/logic/battle/MapUnitCombatant.kt
@@ -26,7 +26,8 @@ class MapUnitCombatant(val unit: MapUnit) : ICombatant {
     }
 
     override fun getDefendingStrength(): Int {
-        if(unit.isEmbarked() && !unit.type.isCivilian()) return 5 * getCivInfo().getEra().ordinal
+        if(unit.isEmbarked() && !unit.type.isCivilian())
+            return 5 * getCivInfo().getEraNumber()
         return unit.baseUnit().strength
     }
 
diff --git a/core/src/com/unciv/logic/civilization/CivInfoStats.kt b/core/src/com/unciv/logic/civilization/CivInfoStats.kt
index d0aa75d6c5..a6c5a628ad 100644
--- a/core/src/com/unciv/logic/civilization/CivInfoStats.kt
+++ b/core/src/com/unciv/logic/civilization/CivInfoStats.kt
@@ -81,7 +81,7 @@ class CivInfoStats(val civInfo: CivilizationInfo){
             if (otherCiv.isCityState() && otherCiv.getCityStateType() == CityStateType.Cultured
                     && otherCiv.getDiplomacyManager(civInfo.civName).relationshipLevel() >= RelationshipLevel.Friend) {
                 val cultureBonus = Stats()
-                var culture = 3f * (civInfo.getEra().ordinal+1)
+                var culture = 3f * (civInfo.getEraNumber()+1)
                 if(civInfo.nation.unique == UniqueAbility.FATHER_GOVERNS_CHILDREN)
                     culture*=1.5f
                 cultureBonus.add(Stat.Culture, culture)
diff --git a/core/src/com/unciv/logic/civilization/CivilizationInfo.kt b/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
index b25dba20af..beaf1d0469 100644
--- a/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
+++ b/core/src/com/unciv/logic/civilization/CivilizationInfo.kt
@@ -2,6 +2,7 @@ package com.unciv.logic.civilization
 
 import com.badlogic.gdx.graphics.Color
 import com.badlogic.gdx.math.Vector2
+import com.sun.xml.internal.bind.v2.runtime.reflect.opt.Const
 import com.unciv.Constants
 import com.unciv.JsonParser
 import com.unciv.UncivGame
@@ -268,13 +269,17 @@ class CivilizationInfo {
             && !isBarbarian() // Barbarians can be never defeated
             && (citiesCreated > 0 || !getCivUnits().any { it.name == Constants.settler })
 
-    fun getEra(): TechEra {
+    fun getEra(): String {
         val maxEraOfTech =  tech.researchedTechnologies
                 .asSequence()
-                .map { it.era() }
-                .max()
-        if(maxEraOfTech!=null) return maxEraOfTech
-        else return TechEra.Ancient
+                .map { it.column!! }
+                .maxBy { it.columnNumber }!!
+                .era
+        return maxEraOfTech
+    }
+
+    fun getEraNumber(): Int {
+        return gameInfo.ruleSet.getEraNumber(getEra())
     }
 
     fun isAtWarWith(otherCiv:CivilizationInfo): Boolean {
@@ -518,12 +523,11 @@ class CivilizationInfo {
 
     fun getResearchAgreementCost(otherCiv: CivilizationInfo): Int {
         // https://forums.civfanatics.com/resources/research-agreements-bnw.25568/
-        val highestEra = sequenceOf(getEra(),otherCiv.getEra()).maxBy { it.ordinal }!!
-        val basicGoldCostOfSignResearchAgreement = when(highestEra){
-            TechEra.Medieval, TechEra.Renaissance -> 250
-            TechEra.Industrial -> 300
-            TechEra.Modern -> 350
-            TechEra.Information, TechEra.Future -> 400
+        val basicGoldCostOfSignResearchAgreement = when(getEra()){
+            "Medieval era", "Renaissance era" -> 250
+            "Industrial era" -> 300
+            "Modern era" -> 350
+            "Information era", Constants.futureEra -> 400
             else -> 0
         }
         return (basicGoldCostOfSignResearchAgreement * gameInfo.gameParameters.gameSpeed.modifier).toInt()
diff --git a/core/src/com/unciv/logic/civilization/PolicyManager.kt b/core/src/com/unciv/logic/civilization/PolicyManager.kt
index 2d7092dd1d..6000d8c890 100644
--- a/core/src/com/unciv/logic/civilization/PolicyManager.kt
+++ b/core/src/com/unciv/logic/civilization/PolicyManager.kt
@@ -86,7 +86,7 @@ class PolicyManager {
         if(isAdopted(policy.name)) return false
         if (policy.name.endsWith("Complete")) return false
         if (!getAdoptedPolicies().containsAll(policy.requires!!)) return false
-        if (policy.branch.era > civInfo.getEra()) return false
+        if (civInfo.gameInfo.ruleSet.getEraNumber(policy.branch.era) > civInfo.getEraNumber()) return false
         return true
     }
 
diff --git a/core/src/com/unciv/logic/civilization/TechManager.kt b/core/src/com/unciv/logic/civilization/TechManager.kt
index fe6d94113f..fd79c37430 100644
--- a/core/src/com/unciv/logic/civilization/TechManager.kt
+++ b/core/src/com/unciv/logic/civilization/TechManager.kt
@@ -223,12 +223,12 @@ class TechManager {
         civInfo.popupAlerts.add(PopupAlert(AlertType.TechResearched,techName))
 
         val currentEra = civInfo.getEra()
-        if (previousEra < currentEra) {
-            civInfo.addNotification("You have entered the [$currentEra era]!", null, Color.GOLD)
+        if (previousEra != currentEra) {
+            civInfo.addNotification("You have entered the [$currentEra]!", null, Color.GOLD)
             if (civInfo.isMajorCiv()) {
                 for (knownCiv in civInfo.getKnownCivs()) {
                     knownCiv.addNotification(
-                        "[${civInfo.civName}] has entered the [$currentEra era]!",
+                        "[${civInfo.civName}] has entered the [$currentEra]!",
                         null,
                         Color.BLUE
                     )
diff --git a/core/src/com/unciv/logic/map/MapUnit.kt b/core/src/com/unciv/logic/map/MapUnit.kt
index 417f7f0d20..c6ac9bfafe 100644
--- a/core/src/com/unciv/logic/map/MapUnit.kt
+++ b/core/src/com/unciv/logic/map/MapUnit.kt
@@ -570,7 +570,7 @@ class MapUnit {
                 .filter {
                     !civInfo.tech.isResearched(it.name)
                             && civInfo.tech.canBeResearched(it.name)
-                            && it.era() == TechEra.Ancient
+                            && it.era() == Constants.ancientEra
                 }
         if(researchableAncientEraTechs.isNotEmpty())
             actions.add {
diff --git a/core/src/com/unciv/logic/trade/TradeEvaluation.kt b/core/src/com/unciv/logic/trade/TradeEvaluation.kt
index 36e7ea1f71..714be5a348 100644
--- a/core/src/com/unciv/logic/trade/TradeEvaluation.kt
+++ b/core/src/com/unciv/logic/trade/TradeEvaluation.kt
@@ -247,6 +247,6 @@ class TradeEvaluation{
     }
 
     fun evaluateResearchAgreementCostForThem(ourCivilization: CivilizationInfo, otherCivilization: CivilizationInfo): Int {
-        return -100 * (ourCivilization.getEra().ordinal-otherCivilization.getEra().ordinal)
+        return -100 * (ourCivilization.getEraNumber()-otherCivilization.getEraNumber())
     }
 }
\ No newline at end of file
diff --git a/core/src/com/unciv/models/metadata/GameParameters.kt b/core/src/com/unciv/models/metadata/GameParameters.kt
index 067da731ff..bfb89ed414 100644
--- a/core/src/com/unciv/models/metadata/GameParameters.kt
+++ b/core/src/com/unciv/models/metadata/GameParameters.kt
@@ -1,5 +1,6 @@
 package com.unciv.models.metadata
 
+import com.unciv.Constants
 import com.unciv.logic.civilization.PlayerType
 import com.unciv.models.ruleset.VictoryType
 import com.unciv.models.ruleset.tech.TechEra
@@ -18,7 +19,7 @@ class GameParameters { // Default values are the default new game
     var nuclearWeaponsEnabled = true
 
     var victoryTypes: ArrayList<VictoryType> = VictoryType.values().toCollection(ArrayList()) // By default, all victory types
-    var startingEra = TechEra.Ancient
+    var startingEra = Constants.ancientEra
 
     var isOnlineMultiplayer = false
     var mods = LinkedHashSet<String>()
diff --git a/core/src/com/unciv/models/ruleset/PolicyBranch.kt b/core/src/com/unciv/models/ruleset/PolicyBranch.kt
index 880b3415b7..71e2547b35 100644
--- a/core/src/com/unciv/models/ruleset/PolicyBranch.kt
+++ b/core/src/com/unciv/models/ruleset/PolicyBranch.kt
@@ -4,5 +4,5 @@ import com.unciv.models.ruleset.tech.TechEra
 
 class PolicyBranch : Policy() {
     var policies: ArrayList<Policy> = arrayListOf()
-    lateinit var era: TechEra
+    lateinit var era: String
 }
diff --git a/core/src/com/unciv/models/ruleset/Ruleset.kt b/core/src/com/unciv/models/ruleset/Ruleset.kt
index 126150c08c..137204e508 100644
--- a/core/src/com/unciv/models/ruleset/Ruleset.kt
+++ b/core/src/com/unciv/models/ruleset/Ruleset.kt
@@ -166,6 +166,12 @@ class Ruleset {
             }
         }
     }
+
+    fun getEras(): List<String> {
+        return technologies.values.map { it.column!!.era }.distinct()
+    }
+
+    fun getEraNumber(era:String) = getEras().indexOf(era)
 }
 
 /** Loading mods is expensive, so let's only do it once and
diff --git a/core/src/com/unciv/models/ruleset/tech/TechColumn.kt b/core/src/com/unciv/models/ruleset/tech/TechColumn.kt
index 1a0db7db1b..b62eed549c 100644
--- a/core/src/com/unciv/models/ruleset/tech/TechColumn.kt
+++ b/core/src/com/unciv/models/ruleset/tech/TechColumn.kt
@@ -4,7 +4,7 @@ import java.util.*
 
 class TechColumn {
     var columnNumber: Int = 0
-    lateinit var era: TechEra
+    lateinit var era: String
     var techs = ArrayList<Technology>()
     var techCost: Int = 0
     var buildingCost: Int = 0
diff --git a/core/src/com/unciv/models/ruleset/tech/TechEra.kt b/core/src/com/unciv/models/ruleset/tech/TechEra.kt
index 993153944b..ac554cb4cb 100644
--- a/core/src/com/unciv/models/ruleset/tech/TechEra.kt
+++ b/core/src/com/unciv/models/ruleset/tech/TechEra.kt
@@ -1,6 +1,6 @@
 package com.unciv.models.ruleset.tech
 
-enum class TechEra{
+enum class TechEra {
     Ancient,
     Classical,
     Medieval,
diff --git a/core/src/com/unciv/ui/newgamescreen/NewGameScreenOptionsTable.kt b/core/src/com/unciv/ui/newgamescreen/NewGameScreenOptionsTable.kt
index 274dbcc510..305cba3e69 100644
--- a/core/src/com/unciv/ui/newgamescreen/NewGameScreenOptionsTable.kt
+++ b/core/src/com/unciv/ui/newgamescreen/NewGameScreenOptionsTable.kt
@@ -160,8 +160,9 @@ class NewGameScreenOptionsTable(val newGameScreen: NewGameScreen, val updatePlay
     private fun addEraSelectBox() {
         // The eras enum values are "Medieval" etc. but are shown to the player as "Medieval era".tr()
         // because in other languages "Medieval era" is one word
-        addSelectBox("{Starting Era}:", TechEra.values().map { it.name + " era" }, newGameParameters.startingEra.name + " era")
-            {newGameParameters.startingEra = TechEra.valueOf(it.replace(" era", ""))}
+        val eras = ruleset.technologies.values.map { it.era() }.distinct()
+        addSelectBox("{Starting Era}:", eras, newGameParameters.startingEra)
+            { newGameParameters.startingEra = it }
     }
 
 
diff --git a/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt b/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
index 18551870c9..6146e903e7 100644
--- a/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
+++ b/core/src/com/unciv/ui/pickerscreens/TechPickerScreen.kt
@@ -82,18 +82,19 @@ class TechPickerScreen(internal val civInfo: CivilizationInfo, centerOnTech: Tec
     }
 
     private fun createTechTable() {
-        val columns = civInfo.gameInfo.ruleSet.technologies.values.map { it.column!!.columnNumber}.max()!! +1
+        val allTechs = civInfo.gameInfo.ruleSet.technologies.values
+        val columns = allTechs.map { it.column!!.columnNumber}.max()!! +1
         val techMatrix = Array<Array<Technology?>>(columns) { arrayOfNulls(10) } // Divided into columns, then rows
 
-        for (technology in civInfo.gameInfo.ruleSet.technologies.values) {
+        for (technology in allTechs) {
             techMatrix[technology.column!!.columnNumber][technology.row - 1] = technology
         }
 
-        val erasName = arrayOf("Ancient","Classical","Medieval","Renaissance","Industrial","Modern","Information","Future")
-        for (i in 0..7) {
-            val j = if (erasName[i]!="Ancient" && erasName[i]!="Future") 2 else 3
-            if (i%2==0) topTable.add((erasName[i]+" era").toLabel().addBorder(2f, Color.BLUE)).fill().colspan(j)
-            else topTable.add((erasName[i]+" era").toLabel().addBorder(2f, Color.FIREBRICK)).fill().colspan(j)
+        val erasName = allTechs.map { it.era() }.distinct()
+        for ((i,eraName) in erasName.withIndex()) {
+            val columnSpan = if (eraName != Constants.ancientEra && eraName != Constants.futureEra) 2 else 3
+            val color = if (i % 2 == 0) Color.BLUE else Color.FIREBRICK
+            topTable.add(eraName.toLabel().addBorder(2f, color)).fill().colspan(columnSpan)
         }
 
         for (i in 0..9) {
diff --git a/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt b/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
index d7307fb0d9..f464a2d1ce 100644
--- a/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
+++ b/core/src/com/unciv/ui/worldscreen/unit/UnitActions.kt
@@ -333,7 +333,7 @@ object UnitActions {
                     uncivSound = UncivSound.Chimes,
                     action = {
                         // http://civilization.wikia.com/wiki/Great_Merchant_(Civ5)
-                        var goldEarned = (350 + 50 * unit.civInfo.getEra().ordinal) * unit.civInfo.gameInfo.gameParameters.gameSpeed.modifier
+                        var goldEarned = (350 + 50 * unit.civInfo.getEraNumber()) * unit.civInfo.gameInfo.gameParameters.gameSpeed.modifier
                         if (unit.civInfo.policies.isAdopted("Commerce Complete"))
                             goldEarned *= 2
                         unit.civInfo.gold += goldEarned.toInt()