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Learn about the heir to the throne, his family, his charitable activities and his official duties. Find out more about his biography, his support for the monarch, the environment, homelessness, mental health and more. William has been a British prince since birth, and was known as " Prince William of Wales " until April 2011. He was created Duke of Cambridge, Earl of Strathearn and Baron Carrickfergus by Elizabeth II on the day of his wedding. Learn about Prince William , the eldest son of King Charles III and the Duke of Cornwall, who married Kate Middleton in 2011. Find out about his royal duties, charity work, and family life in Windsor. William Prince of Wales is the Grandson of Queen Elizabeth II and was born June 21, 1982, including biography, historical timeline and links to the British royal family tree .