Welcome to Wales Prince William and his mother, Princess Diana, receive a warm greeting in Cardiff, the capital of Wales, on St. David's Day (the patron saint of Wales). William, the future prince of Wales and future king, was making his first visit to the principality. He and his mother, the Princess of Wales, were accompanied by Prince Charles, the Prince of Wales. The royal threesome attended a service in seaport city's 12th-century Llandaff Cathedral.