IN THE ROYAL MARRIAGE MARKET THE INFANTA OF SPAIN WAS A TRUE PRIZE. In the eyes of the world, Katharine of Aragon was a precious object to be disposed of for the glory of Spain. Her parents, Queen Isabella and King Ferdinand, send her to England to become the bride of Arthur, Prince of Wales. But soon her frail husband was dead, and a fateful question loomed: Was the marriage consummated, as Katharine's priest avowed, or was the young widow still...