Prince Williamhas always known he would one day sit on the throne ofEnglandas thecommonwealth'sfutureKing, but it wasQueen Elizabeth, the current monarch, who took the time to train her grandson, and the journey has not been easy.
AlthoughtheDuke of Cambridgehas proven himself ready to assume his position as King ofEngland,the Queen(and the rest ofthe Royal Family) once harboured some very serious fears about William's capabilities, namely, his inability to keep calm under pressure.
WATCH: The moment the Queen saved a young Prince William from the wheels of a carriage
According to a royal expert,Queen Elizabeth IIwas forced to mentor William at a young age, as fears grew within Buckingham Palace that the Prince was going to crack under the immense pressure.
Fears only grew afterPrincess Diana - William's mother -gave a sensational TV interview in 1995 withBBCPanorama, where she questionedPrince Charles' abilities to be a good King.
Queen Elizabeth II Laughs With Her Grandsons Prince William And Prince Harry On The Balcony Of Buckingham Palace After The Trooping The Colour Parade, 2003.
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Subsequently,Prince Williambegan meeting with his grandma at the tender age of 13, where the pair would have lunch atWindsor Castleand discuss the responsibilities a royal has to theBritishpublic.
Royal expert and author Ingrid Seward describedthe Queen's intervention in her book,My Husband and I: The Inside Story of 70 Years of the Royal Marriage.
Prince William and Queen Elizabeth II watch a flypast of Spitfire & Hurricane aircraft from the balcony of Buckingham Palace to commemorate the 75th Anniversary of The Battle of Britain on July 10, 2015
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"The one person who could help, who had to help, wasthe Queen.
"She knew only too well what pressures William was facing. She told her advisors she feared he might crack up like his mother had."
Ms Seward continued: "He started joiningthe Queenandthe Dukeof Edinburgh for lunch.
"AfterwardsPrince Philipwould leavethe Queenand her grandson together in the Oak Drawing Room overlooking the quadrangle.”
It looks like the regular meetings paid off because William seems more than ready to succeed his father, the Prince of Wales!
Prince William, his father Prince Charles and Queen Elizabeth II listen to the outdoor service commemorating VJ day 19 August in London, 1995.
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Prince William is married to Kate Middleton and the couple have three children together - heir to the throne Prince George, six, Princess Charlotte, four, and Prince Louis, one.
Milly HaddrickMilly is a journalist who passionately devours all the latest and juiciest news. A devout tea enthusiast who's a firm believer in quality downtime, Milly's weekends are usually spent relaxing with a big plate of food, a nice cuppa and the crossword.