Sep 15, 1066:
Muhammad Kalbid, Kalbid Emirate (Sicily): You're surrounded by infidels, but if you fend off the Sunni and conquer the Catholics then you can establish your own Sultanate of Sicily right on the pope's doorstep.
Gerhard Chatenois, Duchy of Upper Lorraine: Just a duchy title away from being able to found the Kingdom of Lotharingia.
Geraud de Geneve, County of Geneve: The score description is almost taunting. Can you do better by ruling more than your single county?
Gudrod Crovan, Duchy of the Isles: You may not be able to form the Kingdom of the Isles in-game, but you can pretend to.
Guilhem de Poitou, Duchy of Aquitaine: For the Kingdom of Aquitaine, if you can break free from France and avoid the dismemberment of your realm from gavelkind.
Jan 1, 1155:
Henry Plantagenet, Kingdom of England: Start off the Plantagenet dynasty and the Angevin Empire on the right foot and see if the sons you birth end up any better than the ones Henry spawned historically.
Jan 1, 1187:
Raimond de Toulouse, Duchy of Toulouse: With the Cathar heresy at full height, you can choose to crush it, or join it.