kept his wit until the last moments of his life, according to his son, . The late Duke of Edinburgh died on April 9, 2021, aged 99, surrounded by his nearest and dearest at Windsor Castle, just months before what would have been his milestone 100th birthday on June 10.

In a BBC documentary titled Prince Philip: The Royal Family Remembers, which aired in September of the same year as his death, members of the Royal Family gave an unprecedented look into the person behind Philip's public persona. There, King Charles spoke fondly of his father and recalled the last conversation he had with him just one day before he died.

He said that he called his father in Windsor on April 8 to talk about his upcoming birthday in June.

The monarch - who was then the Prince of Wales - said he told his father: "We're talking about your birthday."

But he had to repeat himself louder as his father was hard of hearing, saying: "We're talking about your birthday! And whether there's going to be a reception!"

The late Duke quickly replied: "Well, I've got to be alive for it, haven't I?"

Charles then made a five-word remark: "I knew you'd say that!"

Prince Philip was known to have made many controversial jokes during his time in the Firm.

In 1959, when the late Queen was pregnant with Prince Andrew, he reportedly said: "People want their first child very much.

"They want the second almost as much. If a third comes along they accept it as natural, even if they haven't gone out of their way for it."