 He was a close adviser to King Sebastian I of Portugal and he escorted him, both to the Guadalupe interview (where Sebastian met his uncle, King Philip II of Spain) and to the Portuguese campaign to Morocco.George was killed in the Battle of Alcácer Quibir, together with the King, in 1578.Before, he had married Madalena Girón, sister of the Spanish 1st Duke of Ossuna, from whom he had a single daughter