5 times Diana broke royal protocol

Princess Diana remains a beloved figure years after her untimely death.

Don't miss CNN's six-part documentary series "Diana" featuring rarely seen footage and new interviews that reveal the person behind the princess. "Diana" premieres Sunday, October 10 at 9 p.m. ET/PT.

(CNN)For centuries, the British monarchy has been known for its formal and rigid exterior. Members of the royal family have carried a stoic presence during public engagements, showcasing the institution's affinity to a stiff-upper-lip attitude. But Diana, Princess of Wales, challenged royal norms and made the royal family more relatable.

Her rise to international stardom as a philanthropist and glamorous icon was heavily rooted in her approachable demeanor, kindness and rebellious spirit. In doing so, she made the royal family members more accessible. This influenced the way royals like Catherine, the Duchess of Cambridge, and Meghan, the Duchess of Sussex, interact with the public and the press today.
    Here are five times Princess Diana broke royal protocol.

      1. Diana omitted the word 'obey' from her wedding vows

      Diana, Princess of Wales, with Prince Charles of Wales at their wedding at St Paul Cathedral in London in 1981.
      It's been a longstanding tradition for royal brides to say they will obey their husbands while reciting their wedding vows.
      But when Diana, 20, married Prince Charles, 32, in 1981, she decided to remove the word "obey" from her vows -- breaking royal precedent. Instead, Diana said she would "love him, comfort him, honor him, and keep him, in sickness and in health."
        The original phrase is from the 1662 Anglican Book of Common Prayer, which does not include the word "obey" in the husband's vows toward his wife. Even Princess Elizabeth made her vows to obey her husband, something that would be technically impossible when she later became Queen.
        Both Kate and Meghan followed in Diana's footsteps omitting the word "obey" in their wedding vows decades later.

        2. A royal education outside the palace walls

        Prince Charles, Princess Diana and Prince William attend Prince Harry's first day at Mrs Mynors' nursery school in London in 1987.
        Diana made history again when her eldest son, Prince William, was three and she decided to send him to preschool -- making him the first member of the royal family to attend preschool outside of the Buckingham Palace. In the past, future heirs to the throne stayed at home with a governess.
        In 1985, the Prince and Princess of Wales escorted their eldest son to his first day of school at Jane Mynor's Nursery School in London, according to the New York Times. Princess Diana, who once worked as an assistant teacher, chose the small school because she wanted William to have a normal English child's education, the NYT reported at the time.
        Prince Harry eventually followed in his brother's footsteps by attending the same school two years later. Diana's choice to provide her sons with an early public education showcased not just her bravery to break from royal protocol but to expose her sons to as much a normal life as possible.

        3. Debunking the stigma around HIV/AIDS