Prince Philip's cause of death has been revealed. The Duke of Edinburgh, who died on April 9 at the age of 99, died of "old age," according to a death certificate obtained by The Telegraph.

Queen Elizabeth mourned her husband Prince Philip on Saturday ... Before the ceremony began, Philip's cap and gloves had been placed on his carriage on the grounds of Windsor Castle, a touching ...

Prince Philip joined the Royal Navy in 1939 and served ... looked dashing in a full beard and distinguished cap. Decades later, his grandson looked the princely part with a matching beard and ...