A region in the north-east of Spain. It was an independent kingdom from A.D. 1035 until it merged with Castile in the fifteenth century. During its independence it conquered and ruled over many neighboring or far-flung provinces and city states, such as Naples. The "family pride" presumably pertains to the many noble families with unsullied blood lines that originated in Aragon. I dare say Pooh-Bah himself liked to think he had ancestral roots in the region.

The family pride of a Spaniard from Aragon
Act I