Isabella, queen of Castile; her marriage with Ferdinand of Aragon led to the union under one sceptre of the crowns of Aragon and Castile, which was followed 10 years after by their united occupancy of the throne of all Spain; she was an able woman, and associated with her husband in every affair of State (1451-1504). See Ferdinand V.
Definition taken from The Nuttall Encyclopædia, edited by the Reverend James Wood (1907)
Isac of York * Isabella II.