I'm playing as the Mali Empire in CK2+ and saw a super-Castille and Navarra rise from the start of the game till around 1150, then Mauretania started pushing them back, me backstabbing my muslim brethren made it a more even war though.
It's now 1220, England has inherited super-Castille consisting of all of Galicia, Leon and Castille, I own Portugal and most of the east coast of Spain where Navarra used to be, and am allied with an Iberian muslim minor who was able to crown himself Sultan of a titular title which is pretty kick-ass, what I love about CK2 is how open-ended the game is and Iberia is the perfect showcase of that, for me personally it differs every game who the main powerbrokers in the area are.
Edit: of course, your mileage may vary
It's now 1220, England has inherited super-Castille consisting of all of Galicia, Leon and Castille, I own Portugal and most of the east coast of Spain where Navarra used to be, and am allied with an Iberian muslim minor who was able to crown himself Sultan of a titular title which is pretty kick-ass, what I love about CK2 is how open-ended the game is and Iberia is the perfect showcase of that, for me personally it differs every game who the main powerbrokers in the area are.
Edit: of course, your mileage may vary