In the Papal bull ' of 1555, the Pope had conferred the title King of Ireland on King Philip II of Spain when he was married to Queen Mary. Philip II made no claim to the kingship of Ireland after Mary's death in 1558. He engaged in a lengthy war from 1585 with her sister Elizabeth I, and he and his successor Philip III supported the Irish Catholic rebels up to the siege of Kinsale in 1601. He had been offered the kingship in 1595 by O'Neill and his allies, but turned it down. Given this lengthy support, it was reasonable for Tyrconnell and Tyrone to imagine that they might solicit help from Philip III, but Spanish policy was to maintain the recent (1604) Treaty with England, and its European fleet had been weakened from several conflicts, and destroyed at the Battle of Gibraltar by the Dutch over four months earlier.