Camilla Parker Bowles was furious when she learned that her ex-husband Andrew Parker Bowles was seeing Princess Anne before their engagement.

The Prince of Wales and the Duchess of Cornwall first met in the early 70s. However, their romance was cut short when Prince Charles went away on service with the Royal Navy in 1973. Soon after Camilla dated Andrew and she was not happy when she learned that he was also seeing Prince Charles’ sister Princess Anne.

Tina Brown described Andrew and Princess Anne’s affair “torrid.” The biographer even said that it was a “romantic re-enactment of ‘La Ronde.’” Princess Anne and Camilla were in love with Andrew while Prince Charles fell for Camilla.

According to Penny Junor in her 2017 book "The Duchess," Prince Charles "was falling ever more deeply in love" with Camilla who "was in love with Andrew" in 1972.

Andrew had the reputation of dating multiple women. However, he was reportedly “unusually smitten” with a particular lady who was rumored to be Princess Anne.

“To her fury, Andrew was also seeing Princess Anne, Charles’ feisty younger sister,” Junor wrote.

When Princess Anne and Andrew were still seeing each other, Queen Elizabeth II would invite Andrew to join the royal family at Windsor Castle for Ascot week. Princess Anne and Andrew’s romance provoked Camilla into getting back with the future king to make her man jealous.

“There was an element of tit-for-tat in Camilla’s fling with Charles,” Junor added.

“Her principal motivation was to have some excitement and make Andrew jealous.”

However, Andrew knew all along that his relationship with Princess Anne would never end in marriage. He was a Roman Catholic and was forbidden under the 1701 Act of Succession to marry an heir to the throne. The act was only amended in 2011.

Camilla’s father preferred Andrew over Prince Charles for her. In fact, it was Camilla’s dad and Andrew’s brother who worked together to publish an engagement notice in a newspaper so Andrew would be pressured into proposing to Camilla.

However, Junor revealed that when Camilla set her heart on Andrew he was actually never nice to her. He never made her feel special, but she remained "stubbornly determined" to marry him because she wanted to be Mrs. Parker Bowles, the wife of a handsome cavalry officer. She had no intentions to be the Princess of Wales or Queen.

Since Camilla is now married to Prince Charles, chances are high that she will be a queen consort. However, royal experts have mixed opinions about this matter and it remains a debate because while others are very sure that she will be queen one day, there are some who just don’t think that it’s possible.

Princess Anne and Camilla Parker Bowles
Camilla Parker Bowles reacted with fury when she learned that her ex-husband Andrew was also seeing Prince Charles’ sister Princess Anne. Pictured: Camilla and Princess Anne look on at the Show Jumping Eventing Equestrian on Day 4 of the London 2012 Olympic Games at Greenwich Park on July 31, 2012 in England. Getty Images/Pascal Le Segretain