Queen Elizabeth II became mother-in-law to Princess Diana when she married Charles.
The two appeared to share a friendly and formal relationship through the years.
They seemed to be on good terms even after Charles and Diana's separation.
Princess Diana knew Queen Elizabeth long before she got engaged to Prince Charles, as she had grown up in royal circles. Her father was an equerry to the Queen, according to The Independent.
Source: The Independent
They had a polite but formal relationship, according to Diana's biographer Andrew Morton. This is evident in an image of Diana and the Queen before the wedding, where they shared a kiss on the cheek.
Diana curtsied to the monarch publicly for the first time at her royal wedding at Westminster Abbey on July 29, 1981.
Queen Elizabeth looked on as Charles and Diana shared their first kiss on the palace balcony, marking the first time a royal couple did so.
Through the years, Diana accompanied the monarch to official engagements. In this photo, taken in November 1982, they traveled together to the State Opening of Parliament.
The royal ladies knew how to share a laugh together. Here they are with other members of the royal family as they celebrated the Queen Mother's 87th birthday in 1987.
Diana and the Queen were cordial, even when the princess' marriage broke down. Here, they are pictured at Trooping the Colour in 1992, the same year of the Wales' separation.
Source: The Guardian
They appeared in public together long after Diana and Charles' public split. In this photo, they wore matching lilac outfits as they attended a royal engagement in 1994.
Diana died in a car accident in Paris on August 31, 1997. The monarch paid tribute to the princess with a speech, saying she "was an exceptional and gifted human being."
"She was an exceptional and gifted human being. In good times and bad, she never lost her capacity to smile and laugh, nor to inspire others with her warmth and kindness," the Queen said in a televised speech at Buckingham Palace on September 5, 1997.
"I admired and respected her — for her energy and commitment to others, and especially for her devotion to her two boys. This week at Balmoral, we have all been trying to help William and Harry come to terms with the devastating loss that they and the rest of us have suffered," she added.
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