William Hickling Prescott,
The History of the Reign of Ferdinand and Isabella the Catholic…
“ He assured him of the satisfaction which the king of Aragon had experienced, at receiving intelligence of his projected expedition against the infidel. Nothing gave his master so great contentment, as to see his brother monarchs employing their arms, and expending their revenues, against the enemies of the Cross; where even failure was greater gain than success in other wars. He offered Ferdinand's assistance in the prosecution of such wars, even though they should be directed against the Mahometans of Africa, over whom the papal sanction had given Spain exclusive rights of conquest. ”
