diff --git a/core/src/com/unciv/logic/battle/BattleDamage.kt b/core/src/com/unciv/logic/battle/BattleDamage.kt
index ad471daf6f..bc1c69d0b3 100644
--- a/core/src/com/unciv/logic/battle/BattleDamage.kt
+++ b/core/src/com/unciv/logic/battle/BattleDamage.kt
@@ -235,11 +235,7 @@ object BattleDamage {
     private fun getTileSpecificModifiers(unit: MapUnitCombatant, tile: TileInfo): Counter<String> {
         val modifiers = Counter<String>()
 
-        for (unique in unit.unit.getMatchingUniques("+[]% Strength in []")
-                + unit.getCivInfo()
-            // Deprecated since 3.16.7
-                .getMatchingUniques("+[]% Strength for units fighting in []")) {
-            //
+        for (unique in unit.unit.getMatchingUniques("+[]% Strength in []")) {
             val filter = unique.params[1]
             if (tile.matchesFilter(filter, unit.getCivInfo()))
                 modifiers.add(filter, unique.params[0].toInt())
diff --git a/core/src/com/unciv/models/ruleset/Building.kt b/core/src/com/unciv/models/ruleset/Building.kt
index f2e6718061..ceb05b11c6 100644
--- a/core/src/com/unciv/models/ruleset/Building.kt
+++ b/core/src/com/unciv/models/ruleset/Building.kt
@@ -365,18 +365,6 @@ class Building : NamedStats(), INonPerpetualConstruction, ICivilopediaText {
         var cost = getBaseBuyCost(cityInfo, stat)?.toDouble()
         if (cost == null) return null
 
-        // Deprecated since 3.15.15
-            if (stat == Stat.Gold) {
-                for (unique in cityInfo.getMatchingUniques("Cost of purchasing items in cities reduced by []%"))
-                    cost *= 1 - (unique.params[0].toFloat() / 100)
-
-                for (unique in cityInfo.getMatchingUniques("Cost of purchasing [] buildings reduced by []%")) {
-                    if (matchesFilter(unique.params[0]))
-                        cost *= 1 - (unique.params[1].toFloat() / 100)
-                }
-            }
-        //
-
         for (unique in cityInfo.getMatchingUniques("[] cost of purchasing items in cities []%"))
             if (stat.name == unique.params[0])
                 cost *= unique.params[1].toPercent()
diff --git a/core/src/com/unciv/models/ruleset/Difficulty.kt b/core/src/com/unciv/models/ruleset/Difficulty.kt
index 5bbe319607..0c806bb6e2 100644
--- a/core/src/com/unciv/models/ruleset/Difficulty.kt
+++ b/core/src/com/unciv/models/ruleset/Difficulty.kt
@@ -15,7 +15,6 @@ class Difficulty: INamed, ICivilopediaText {
     var policyCostModifier:Float = 1f
     var unhappinessModifier:Float = 1f
     var barbarianBonus:Float = 0f
-    var startingUnits = ArrayList<String>() // Deprecated since 3.15.8 - with eras
     var playerBonusStartingUnits = ArrayList<String>()
 
     var aiCityGrowthModifier:Float = 1f
@@ -25,9 +24,7 @@ class Difficulty: INamed, ICivilopediaText {
     var aiBuildingMaintenanceModifier:Float = 1f
     var aiUnitMaintenanceModifier = 1f
     var aiFreeTechs = ArrayList<String>()
-    var aiMajorCivStartingUnits = ArrayList<String>() // Deprecated since 3.15.8 - with eras
     var aiMajorCivBonusStartingUnits = ArrayList<String>()
-    var aiCityStateStartingUnits = ArrayList<String>() // Deprecated since 3.15.8
     var aiCityStateBonusStartingUnits = ArrayList<String>()
     var aiUnhappinessModifier = 1f
     var turnBarbariansCanEnterPlayerTiles = 0
diff --git a/core/src/com/unciv/models/ruleset/Unique.kt b/core/src/com/unciv/models/ruleset/Unique.kt
index a8b333566f..988adad9d2 100644
--- a/core/src/com/unciv/models/ruleset/Unique.kt
+++ b/core/src/com/unciv/models/ruleset/Unique.kt
@@ -168,21 +168,6 @@ object UniqueTriggerActivation {
                     return civInfo.addUnit(greatPerson.name, chosenCity) != null
                 }
             }
-            // Deprecated since 3.15.4
-            "+1 population in each city" -> {
-                for (city in civInfo.cities) {
-                    city.population.addPopulation(1)
-                }
-                if (notification != null) {
-                    civInfo.addNotification(
-                        notification,
-                        LocationAction(civInfo.cities.map { it.location }),
-                        NotificationIcon.Population
-                    )
-                }
-                return true
-            }
-            //
             "[] population []" -> {
                 val citiesWithPopulationChanged: MutableList<Vector2> = mutableListOf()
                 for (city in civInfo.cities) {
diff --git a/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt b/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
index b019b1668d..7464745d1a 100644
--- a/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
+++ b/core/src/com/unciv/models/ruleset/unit/BaseUnit.kt
@@ -425,6 +425,7 @@ class BaseUnit : INamed, INonPerpetualConstruction, ICivilopediaText {
 
     fun addConstructionBonuses(unit: MapUnit, cityConstructions: CityConstructions) {
         val civInfo = cityConstructions.cityInfo.civInfo
+
         @Suppress("LocalVariableName")
         var XP = 0
 
@@ -437,25 +438,20 @@ class BaseUnit : INamed, INonPerpetualConstruction, ICivilopediaText {
         }
         unit.promotions.XP = XP
 
-        for (unique in
-        cityConstructions.cityInfo.getMatchingUniques("All newly-trained [] units [] receive the [] promotion")
-            .filter { cityConstructions.cityInfo.matchesFilter(it.params[1]) } +
-            // Deprecated since 3.15.9
-                cityConstructions.cityInfo.getLocalMatchingUniques("All newly-trained [] units in this city receive the [] promotion")
-            //
-        ) {
+        for (unique in cityConstructions.cityInfo.getMatchingUniques("All newly-trained [] units [] receive the [] promotion")
+            .filter { cityConstructions.cityInfo.matchesFilter(it.params[1]) }) {
             val filter = unique.params[0]
             val promotion = unique.params.last()
 
-            if (unit.matchesFilter(filter) 
+            if (unit.matchesFilter(filter)
                 || (
-                    filter == "relevant" 
-                    && civInfo.gameInfo.ruleSet.unitPromotions.values
-                        .any {
-                            it.name == promotion
-                            && unit.type.name in it.unitTypes
-                        }
-                )
+                        filter == "relevant"
+                                && civInfo.gameInfo.ruleSet.unitPromotions.values
+                            .any {
+                                it.name == promotion
+                                        && unit.type.name in it.unitTypes
+                            }
+                        )
             ) {
                 unit.promotions.addPromotion(promotion, isFree = true)
             }
@@ -492,9 +488,6 @@ class BaseUnit : INamed, INonPerpetualConstruction, ICivilopediaText {
 
             "Nuclear Weapon" -> isNuclearWeapon()
             "Great Person", "Great" -> isGreatPerson()
-            // Deprecated as of 3.15.2
-                "military water" -> isMilitary() && isWaterUnit()
-            //
             else -> {
                 if (getType().matchesFilter(filter)) return true
                 if (
@@ -509,8 +502,7 @@ class BaseUnit : INamed, INonPerpetualConstruction, ICivilopediaText {
 
     fun isGreatPerson() = uniqueObjects.any { it.placeholderText == "Great Person - []" }
 
-    // "Nuclear Weapon" unique deprecated since 3.15.4
-    fun isNuclearWeapon() = uniqueObjects.any { it.placeholderText == "Nuclear Weapon" || it.placeholderText == "Nuclear weapon of Strength []" }
+    fun isNuclearWeapon() = uniqueObjects.any { it.placeholderText == "Nuclear weapon of Strength []" }
 
     fun movesLikeAirUnits() = getType().getMovementType() == UnitMovementType.Air