make_councillor_start_up_effect

make_councillor_start_up_effect = {
	save_scope_as = new_councillor
	liege_or_court_owner = {
		# Kurultai cp slots only exist under nomadic government (liege_or_court_owner may be a non-nomad direct liege).
		if = {
			limit = { government_has_flag = government_is_nomadic }
			if = {
				limit = {
					NOT = { exists = cp:councillor_kurultai_1 }
					scope:new_councillor = {
						can_be_kurultai_trigger = {
							COURT_OWNER = scope:new_councillor.liege_or_court_owner 
							CP1 = councillor_kurultai_2
							CP2 = councillor_kurultai_3
							CP3 = councillor_kurultai_4
						}
					}
				}
				assign_councillor_type = {
					type = councillor_kurultai_1
					remove_existing_councillor = yes
					target = scope:new_councillor
				}
			}
			else_if = {
				limit = {
					NOT = { exists = cp:councillor_kurultai_2 }
					scope:new_councillor = {
						can_be_kurultai_trigger = {
							COURT_OWNER = scope:new_councillor.liege_or_court_owner 
							CP1 = councillor_kurultai_1
							CP2 = councillor_kurultai_3
							CP3 = councillor_kurultai_4
						}
					}
				}
				assign_councillor_type = {
					type = councillor_kurultai_2
					remove_existing_councillor = yes
					target = scope:new_councillor
				}
			}
			else_if = {
				limit = {
					NOT = { exists = cp:councillor_kurultai_3 }
					scope:new_councillor = {
						can_be_kurultai_trigger = {
							COURT_OWNER = scope:new_councillor.liege_or_court_owner  
							CP1 = councillor_kurultai_1
							CP2 = councillor_kurultai_2
							CP3 = councillor_kurultai_4
						}
					}
				}
				assign_councillor_type = {
					type = councillor_kurultai_3
					remove_existing_councillor = yes
					target = scope:new_councillor
				}
			}
			else_if = {
				limit = {
					NOT = { exists = cp:councillor_kurultai_4 }
					scope:new_councillor = {
						can_be_kurultai_trigger = {
							COURT_OWNER = scope:new_councillor.liege_or_court_owner 
							CP1 = councillor_kurultai_1
							CP2 = councillor_kurultai_2
							CP3 = councillor_kurultai_3
						}
					}
				}
				assign_councillor_type = {
					type = councillor_kurultai_4
					remove_existing_councillor = yes
					target = scope:new_councillor
				}
			}
		}
	}
}

As written in game/common/scripted_effects/00_councillor_effects.txt.