Calais, the last remaining continental possession of the Kingdom, was lost in 1558, during the reign of Philip and Mary I. Their successor, Elizabeth I, consolidated the new and increasingly Protestant Church of England. She also began to build up the kingdom's naval strength, on the foundations Henry VIII had laid down. By 1588, her new navy was strong enough to defeat the Spanish Armada, which had sought to invade England to put a Catholic monarch on the throne in her place.