Knatchbull married Philip’s godson, Norton Knatchbull, Lord Romsey, on Oct. 20, 1979. They’re also distantly related by blood: Norton is the grandson of of Philip’s uncle, Louis Mountbatten.

HRH Prince Philip, The Duke of Edinburgh and Lady Penny Romsey mount their mini motorbikes during the Royal Windsor Horse Show at Home Park, Windsor Castle on May 13, 2005 (Getty Images) ...

In his absence, Penny had taken up the ceremonial roles and duties that Norton had been responsible for, becoming the High Steward of Romsey and patron of Romsey Agricultural and Horse Show Society.

Norton and Penny Knatchbull photographed on their wedding day, October 20, 1979, at Romsey Abbey, in Hampshire, U.K. Norton was Prince Philip's godson and cousin, and his wife had a close ...

Penelope "Penny" Knatchbull and Norton Knatchbull photographed at Broadlands house, April 1, ... "We would like to apologize to both Prince Charles and Lady Romsey, her husband and her family." ...

“It was Phillip who encouraged Penny Romsey (now Countess Mountbatten) to take up carriage driving,” Ingrid Seward wrote in her biography of the consort, Prince Philip Revealed.

Penny (also known as Countess Mountbatten of Burma) is technically Prince Philip’s relative by marriage: In 1979, she wed Norton Knatchbull, grandson of Louis Mountbatten, Philip’s favourite uncle.

Also known as Lady Romsey from 1979 to 2005, Penelope first became associated with the royal family after marrying Norton Knatchbull (also known as Lord Romsey at the time), who is second cousins ...

HRH Prince Philip, The Duke of Edinburgh and Lady Penny Romsey mount their mini motorbikes during the Royal Windsor Horse Show at Home Park, Windsor Castle on May 13, 2005 (Getty Images) ...

Season Five of “The Crown” explores Prince Philip’s carriage riding and friendship with Penny Knatchbull. All about their relationship and her daughter Leonora.