Before Princess Diana became “The People’s Princess,” she was Lady Diana Spencer. Her father, Edward John “Johnnie” Spencer, Viscount Althorp, was a nobleman and friend of the British family. In 1975, he inherited the title of Earl Spencer after his father passed away.
Diana led a relatively normal life when she was growing up. Although her family had connections to the royal family, Diana grew up much like any other child. She was very well-off, of course, but she went to school, played with her siblings, and spent time outside like other kids.
Everything changed when Prince Charles, the oldest son of Queen Elizabeth II and Prince Philip, noticed her and started pursuing her to be his bride. Eventually, the two of them got engaged and married, and Lady Diana Spencer became Princess Diana. They had two children together, Prince William and Prince Harry.
As Princess, Diana was well-loved by the public. She was known for her style, compassion, charity work, devotion to her children, and charisma. She helped the royal family transition to the modern age and her legacy has lived on for decades.
Source : https://www.littlethings.com/lady-diana-spencer-before-princess/