Even 24 years after her untimely death, we’re still learning shocking—and even dark—facts about the personal life of the People’s Princess.

She recorded her thoughts on tape

Much of what we know about Princess Diana’s personal life is thanks to audiotapes she recorded herself. Once she recognized her marriage to Prince Charles was falling apart, she documented her side of the story on a tape recorder and gave the tapes to her close friend, Dr. James Colthurst. He, in turn, gave them to journalist Andrew Morton so her words could get out to the public. From those tapes, Morton published the biography DIANA: Her True Story—In Her Own Words in 1992. No one knew Diana had a hand in the book’s production until after her death, just one of the surprising facts you probably didn’t know about Princess Diana.

Her sister dated Prince Charles

There are definitely ways to improve your relationship with your sibling, but we’re not sure if sharing a boyfriend is one of them. Before Diana and Charles started going steady, he dated her sister, Sarah. She introduced the two when Diana was just 16 and takes credit for their falling in love, calling herself Cupid. These are the conspiracy theories that still surround Princess Diana’s death.

Her grandmother worked for the Queen

As prominent a public figure as Queen Elizabeth is, there’s still a lot that the public doesn’t know about her. One of those more intriguing bits of trivia is that Queen Elizabeth The Queen Mother was close friends with Princess Diana’s grandmother, Ruth Fermoy. She was one of Her Majesty’s ladies-in-waiting and later held the title Woman of the Bedchamber, which meant that she was the Queen’s right-hand woman and assisted with important social engagements. This is what Princess Diana lost after her divorce from Prince Charles.

She and her husband were related

The royal family tree can get pretty complicated, but don’t worry, there’s nothing incestuous about this marriage. Princess Di and Prince Charles were distantly related. Specifically, they were 16th cousins once removed, through King Henry VII. Browse these photos from Prince Charles and Princess Diana’s wedding.

She had a poor sex life

In her tape recordings, Princess Diana discussed her married life in great detail, even calling her wedding day “the worst day of her life.” Specifically, she talked at length about her lack of a sex life, saying that she and her husband had sex but it was “very odd.” By the time she made the recordings, their sex life had been going downhill for seven years. She went on to say, “There was no requirement for (sex) from his case. Sort of once every three weeks… and I kept thinking it followed a pattern. He used to see his lady (Camilla) once every three weeks before we got married.” Learn more about the real story of what happened between Charles and Diana.

She messed up her wedding vows

In hindsight, Princess Diana messing up her wedding vows may seem like a sign her marriage was bound to fail, but in reality, she just caught a case of wedding day jitters. During the vows, she called her husband “Philip Charles” instead of “Charles Philip,” mixing up his first and middle names. Here are all the details on Princess Diana’s wedding dress.

She ate in the kitchen

It was against royal family etiquette to eat in the kitchen with staffers and not in a dining room, but Princess Diana was no stranger to breaking protocol. Her personal chef, Darren McGrady, said she would just walk into the kitchen and eat at a countertop while he tidied up, which was unheard of coming from any royal. She would even make coffee for the two of them. Check out these stunning, rarely seen photos of the People’s Princess and these photos of a young Princess Diana.

She attempted suicide

One of the most troubling revelations from Princess Diana’s audiotapes was that she struggled with depression and even attempted to take her own life. She said in her recordings, “I was so depressed, and I was trying to cut my wrists with razor blades.” She also talked about having bulimia and that the eating disorder started after Prince Charles put his hand on her waist and said, “A bit chubby here, aren’t we?” This is the Christmas gift from Princess Diana that Prince Charles hated.

She was harassed by the paparazzi

Prince William and Prince Harry are opening up more about their memories of their mother. Some are uplifting, like how she involved them in her charitable work. But their recollections of Diana dealing with the paparazzi are disturbing. As Prince William says in the ITV and HBO documentary, Diana, Our Mother: Her Life and Legacy: “If you are the Princess of Wales and you’re a mother, I don’t believe being chased by 30 guys on motorbikes who block your path, who spit at you to get a reaction from you and make a woman cry in public to get a photograph, is appropriate. Harry and I, we had to live through that.”