Iberian Hostilities

The Dominance ending of the Iberian Struggle - and you must be properly Involved (Interloper status doesn't count). The wiki route: in 867, replace the Umayyad Sultan with a custom Andalusian ruler of the Muwalladi faith, surrender the starting wars, convert your capital kingdom's counties and create a second kingdom title before a vassal beats you to it. Push the Struggle into the Hostility phase (repeatedly building tax buildings in castle holdings nudges it), then drive it to Dominance. One ending per campaign, so Iberian Compromise and Iberian Conciliation each need their own run - and Holidaying in Iberia can ride along with whichever you pick.