Kate and William met while studying at the University of St Andrews in Scotland.
While the world fell in love with the then-Kate Middleton, one member of the Royal Family reportedly did not approve of the match.
Camilla, who became a member of the Royal Family when she married Prince Charles in 2005, allegedly tried to the couple to break up.
Camilla believed Kate was ”pretty, but rather dim” and “too lowly” to marry into the Royal Family, according to the book ‘Game of Crowns: Elizabeth, Camilla, Kate, and the Throne’ by Christopher Anderson.
Camilla is even said to have asked Prince Charles to convince William to end things with Kate.
After six years of being together, Kate and William briefly broke up in 2007 and the book claims Camilla at the time described the separation as “wise”.
During an interview, following the announcement of their engagement, Prince William said: “We did split up for a bit.
“We were both very young, we were both at university, we were both finding ourselves as such, being different characters.
“We were both trying to find our own way with a bit of space, we were growing up and then it worked out for the better.”
Kate also shared her view on the split, adding: “I think I at the time wasn’t very happy about it, but actually it made me a stronger person.
“You find out things about yourself that maybe you hadn’t realised, or I think you can get quite consumed by a relationship when you are younger.
“And I really valued that time for me as well although I didn’t think it at the time, looking back on it.”
While the pair were separated Kate visited Ireland with her mother Carole Middleton.
Although the royal couple have never said what the reasons for the split were, pressure from the paparazzi has been tipped as being a big source of tension for Kate and William.
The Duke and Duchess pf Cambridge were thought to have broken up in March 2007 but they were back together by October of the same year.
The break up clearly did not affect their deep relationship as Kate and William married in Westminster Abbey in April 2011.
They also have three children together: Prince George, aged five, Princess Charlotte, aged three, and baby Prince Louis.
A Clarence House spokesman said they would not comment on the book’s claims.