diff --git a/common/buildings/00_special_buildings.txt b/common/buildings/00_special_buildings.txt
index 65a0ab63c..303196528 100644
--- a/common/buildings/00_special_buildings.txt
+++ b/common/buildings/00_special_buildings.txt
@@ -3281,13 +3281,16 @@ hagia_sophia_01 = {
 	}
 	
 	show_disabled = yes
-	
+
 	cost_gold = 1000
+	cost_piety = 1000
 
 	character_modifier = {
 		monthly_piety = 0.5
-		monthly_piety_gain_per_knight_add = 0.1
 		martial_per_piety_level = 2
+		prowess = 2
+		knight_limit = 2
+		knight_effectiveness_mult = 0.2
 		monthly_dynasty_prestige_mult = 0.05
 		religious_vassal_opinion = 10
 		zealot_opinion = 10
@@ -3305,6 +3308,7 @@ hagia_sophia_01 = {
 		monthly_income = 0.4
 	}
 
+
 	on_complete = {
 		#Regular Mandala Boon
 		mandala_built_piety_duchy_building_t3_effect = yes