Penny Knatchbull—who? "The Crown" depicts her and Prince Philip.

"The Crown" season five covers Prince Philip's "companionship" with Penny Knatchbull, the Countess Mountbatten of Burma.

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After retiring from polo in 1971, the prince took up competitive carriage riding, and the two became friends.

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She became the Duke of Edinburgh's "second-most significant woman."

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According to Seward, Philip also encouraged Knatchbull, also known as Penny Romsey, to play.

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"The Crown" illustrates Philip's close relationship with Knatchbull beyond sports. She stayed close to the royals.

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In 2022, she attended Queen Elizabeth II's funeral at 96.

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