Ferdinand's 1469 marriage to Isabella I of Castile brought about a dynastic union of the Crown of Aragon with Castile. After the 1512 invasion of the Kingdom of Navarre, in 1516 the monarchies were formally united into a single Monarchy of Spain ("Kingdom of the Spains", as it was sometimes known). Each kingdom of the Monarchy conserved its political institutions and maintained its own courts, laws, public administration, and separate coinage of money.