Prince William has long maintained the image of a calm and composed future king, especially during public outings. However, behind palace walls, reports now suggest that his fiery temper has become a growing source of concern, even for his father, King Charles.
A new book by a royal expert claims the heir apparent is “capable of great bellowing” tantrums, something Prince Harry previously hinted at.
Earlier reports have also suggested that William’s wife, Kate Middleton, has often acted as the glue between father and son during moments of occasional tension.
In the past, several reports have suggested that William and Charles do not always see eye to eye on certain issues.
Now, according to royal biographer Christopher Andersen, some of those disagreements can become extremely heated, particularly on the prince’s part, as he is reportedly “capable of great bellowing tantrums.”
Andersen claimed that when this happens, Charles is sometimes left terrified by the confrontations, much like anyone would be when faced with William’s far louder and more forceful voice.
“When he gets frustrated, he does resort to shouting [at the king],” an ex-employee at Highgrove House, Charles’ country estate, told the royal expert, per Page Six. “William has a huge, booming voice. Much louder than his father’s, so it’s not something you soon forget.”
Prince Harry Once Claimed William’s Anger Turned Physical
William’s alleged temper was once highlighted by Harry in his 2023 memoir, “Spare.”
The Duke of Sussex recounted a heated confrontation between the brothers at Nottingham Cottage, where tensions reportedly boiled over over several personal issues involving his wife, Meghan Markle, as well as their ongoing struggles with the British press.
As the argument escalated, Harry claimed one of his remarks angered William so deeply that the future king became physical.
Harry wrote that the incident happened quickly, alleging that William grabbed him by the collar, broke his necklace, and knocked him to the floor, according to The Guardian. He further claimed he landed on a dog bowl and was left briefly dazed before telling William to leave.
Other Royal Experts Have Weighed In On Prince William’s Temper
William’s alleged propensity for anger has also been noted in several other royal commentaries, with some accounts even citing the views of senior members of the royal family.
Robert Lacey, in his 2020 book “Battle of Brothers,” claimed that Queen Camilla once told a friend she was shocked by “the ranting and raving that William unleashed on occasion against her husband in her presence.”
Similar claims were echoed by royal author Robert Jobson in his 2026 book, “The Windsor Legacy: A Royal Dynasty of Secrets, Scandal, and Survival.”
Excerpts from the book alleged that William is prone to “mood swings,” can be overly “assertive with his father,” and that his “fiery temper” is often “difficult to handle.”
Kate Middleton Reportedly Acts As The ‘Glue’ Between Charles And William
Amid the occasional feuding between father and son, it is Catherine, Princess of Wales, who has reportedly often acted as a calming influence within the family.
In January 2025, British broadcaster and photographer Helena Chard told Fox News Digital that King Charles III is “extremely fond and proud of his daughter-in-law,” whom many already view as one of the British monarchy’s brightest assets.
At the time, Chard described how the pair share similar passions, with the King reportedly in awe of Catherine’s “wow factor, empathy and resilience.”
More importantly, Chard claimed Catherine’s “solution-focused” nature is the “glue” that has helped maintain the bond between Charles and his son.
Prince William Reportedly Wants To Avoid King Charles’ Mistakes
When William eventually takes the throne, his reign will likely look very different from that of his father, according to royal expert Valentine Low.
GB News quoted Low saying that William is very much “different from his father,” adding that he is also “very aware of what he regards as mistakes his father has made.”
The prince reportedly intends not to “repeat them,” with one of those alleged mistakes being a lack of awareness about the boundaries between what one can do as Prince of Wales and as King, and how those actions could affect the government itself.