The pair met back in 1934, when they both attended the wedding of a mutual relative.

The future Queen was actually only 8 years old.

The pair began exchanging letters, and finally ended up engaged in 1946.

Queen Elizabeth and Prince Philip waving

A friend of Queen Elizabeth and Princess Margaret also documented much about the sisters in her own diaries.

Howard wrote in her own diary that Elizabeth asked her, “Can you keep a secret?”

before gushing about her “boy,” Philip.

Queen Elizabeth and Prince Philip waving from car

Howard added, “[Lilibet] says she cuts [his] photos out of the paper!”

Later in the diary, Howard also wrote that a 16-year-old Elizabeth was already concerned about marriage.

“She said she wondered if she’d ever marry.