Adrian IV wasnt the one who donated Ireland to the English Crown?
He did that because of the forged Donatio Constantini which aleggedly gave the western half of the empire to the Roman Popes.
This is proven to be a forgery dated back to Pope Stephen II.
Anyway i would like to see Popes in Medieval 2 take names like Paul, Callixtus, Pius etc. and numbered also.
This should be fixed in the patch.