WordNet (r) 3.0 (2006):

Isabella I
    n 1: the queen of Castile whose marriage to Ferdinand of Aragon
         in 1469 marked the beginning of the modern state of Spain;
         they instituted the Spanish Inquisition in 1478 and
         sponsored the voyages of Christopher Columbus in 1492
         (1451-1504) [syn: Isabella, Queen Isabella, Isabella
         I, Isabella the Catholic]