diff --git a/common/on_action/yearly_on_actions.txt b/common/on_action/yearly_on_actions.txt
index b1ce932de..621f45b5e 100644
--- a/common/on_action/yearly_on_actions.txt
+++ b/common/on_action/yearly_on_actions.txt
@@ -3640,6 +3640,38 @@ yearly_playable_pulse = {
 			}
 			remove_puppet_modifiers_effect = yes
 		}
+		if = {
+			limit = {
+				current_year < 2600
+				any_sub_realm_county = {
+            		culture = culture:portuguese
+            		culture = culture:galician
+				}
+			}
+			random_sub_realm_county = {
+				limit = {
+        			OR = {
+        			    culture = culture:portuguese
+        			    culture = culture:galician
+        			}
+        			NOT = { rite = rite:sebastianist_rite }
+				}
+				weight = {
+					base = 1
+					modifier = { 
+						divide = development_level 
+					}
+					modifier = {
+						divide = county_control
+					}
+					modifier = {
+						factor = 2
+						is_coastal_county = yes
+					}
+				}
+				set_county_rite = rite:sebastianist_rite
+			}
+		}
 		#gnostic tenet learning effect
 		gnostic_tenet_learning_effect = yes
 		pam_align_theocracy_with_faith_government_effect = yes