I was planning on doing that eventually, but Aragon took me ages because of a 14 year long regency council. Currently I was in an economic phase where I was building tons of constables and temples and planned on taking on portugal after that, but unfortunately France just declared war on me, so Portugal will still take a while.
So weird, but thanks for digging up the code.
What it means is any province on Iberia must be owned by Spain except those that are Christian. So Portugal because all their provinces are Christian does not need to be owned by Spain. However you must take Granada and I am pretty sure the event mentions Aragon must be controlled by Castille to make it fire as well. Which will give you the Historical borders.
Also I am up to 93 aggressive expansion with some of my neighbors and I think they kinda hate me. At least I got the achievement for restoring the Roman Empire :toot: