And included a sentimental detail inside.

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Queen Elizabeth said her final goodbye to Prince Philip. On Saturday, the Queen mourned the loss of her husband during his funeral at St. George's Chapel in Windsor, and left a handwritten letter on his coffin that was visible throughout the service. The monarch signed the note with her childhood nickname "Lilibet," and according to People, Philip was the last person to call her by that.

However, the Palace declined to comment on the details of her note, saying it's "private."

Queen Elizabeth

During the ceremony, the Queen sat alone in the church pews with her head down for most of the service. She dressed in all-black, and accessorized with a symbolic brooch that has a romantic royal history.

Queen Elizabeth and Prince Philip married in 1947, and were together for 73 years. Though she didn't speak at his funeral, the Queen has previously expressed her grief in statements on social media.

Ahead of his funeral, she shared a never-before-seen photograph of the couple on the royal family's official Instagram account. "Her Majesty and the Royal Family are grateful for all the messages of condolence from around the world and have been touched to see and hear so many people sharing fond memories of The Duke, in celebration of his life," the post read, while another one shortly following his death included a touching quote the Queen made back in 1997.

She said, "He has, quite simply, been my strength and stay all these years, and I, and his whole family, and this and many other countries, owe him a debt greater than he would ever claim, or we shall ever know."