3: The number of marriages that he's had. He divorced his first wife, Victoria Aitken, in 1997 and his second wife, Caroline Freud, in 2007. He is currently married to Karen Spencer, Countess Spencer, with whom he tied the knot in 2011.
3: The number of older sisters that he has. Sarah was born in 1955, Jane was born in 1957, and Diana was born in 1961, three years before Charles was born.
4: Age he was when his parents divorced in 1969.
5: The number of history books that he's written: Althorp, the Story of an English House; The Spencers: a Personal History of an English Family; Blenheim, Battle For Europe; Prince Rupert: The Last Cavalier; and Killers of the King: The Men Who Dared to Execute Charles.