Prince Philip had a unique yet rocky bond with Princess Diana.

Having married into the royal family in 1947, Philip — who died on Friday at age 99 — could understand the difficulties of being an "outsider" in the world's most famous family. He was also "initially charmed" by the beautiful, fun-loving princess as she struggled to adapt to her new position in life.

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Inside Prince Philip's Rocky Relationship with Princess Diana — and Their Personal Letters | PEOPLE
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