Charles III

His marriage to Lady Diana was tumultuous from the start.

An excerpt from the article 23 facts about Charles III

The couple had two sons: Wilhelm (born June 21, 1982) and Henry (born September 15, 1984). The family idyll did not last long. A very young Diana (she was only 20 years old at the time of her marriage) was mentally unable to cope with the situation she found herself in, especially since she could not enjoy the devotion and support of her husband, who returned to the love of his life, Kamila, after two years of marriage.

Over the next few years, disagreements and resentments between the spouses deepened, and Diana also began to seek comfort in the arms of other men. The situation was further aggravated by scandals such as Camillagate (also called Tampongate by some), when recordings of telephone conversations between lovers with rather intimate and explicit content came to light in 1993. That same year, the book Diana: Her True Story - In Her Own Words by Andrew Morton, in which Lady Di described the behind-the-scenes relationship with the heir to the British throne, casting him in a very unfavorable light. 

The separation of the couple was announced on December 9, 1992. It was an extremely unfavorable year in the history of the British monarchy, also called annus horribilis by the Queen herself, because the separations occurred in two other royal families - the siblings Charles, Anne and Andrew.