Prince William is the elder son of Prince Charles and Diana, Princess of Wales. He is second in line to succeed the thrones of 16 Commonwealth realms, including the United Kingdom. He obtained a degree from the University of St Andrews and trained as an air ambulance pilot, now serving as a co-pilot on a Sea King helicopter. He married Catherine Middleton in 2011 and received the titles Duke of Cambridge, Earl of Strathearn, and Baron Carrickfergus on his wedding day.