From Prince to King and 'Loving It': Charles III Is 'Much Happier' Since Inheriting the Crown for One Relatable Reason

King Charles III waited 70 years, seven months and two days to become king, and now the monarch is reportedly 'much happier' he now has the reins of power.

"He's thoroughly enjoying being monarch," Charles III biographer Robert Hardman shared. "He's obviously had a dreadful year, after that very bleak diagnosis he had, but things are definitely on an upward trajectory."

He added that His Majesty is "actually much happier [since becoming King]. One of his close friends said to me, there's a new kind of serenity about him since he's become king, because he no longer has to ask people if he can do things, he's in charge."

The King had the longest wait for the throne of any heir in the 1,200-year history of the British monarchy. The sovereign was heir apparent the entire length of his mother, Queen Elizabeth II's historic reign, and was Prince of Wales for a bit over 64 years of her queenship.

"No one had waited to become monarch in history," Hardman continued. "To become king at 73, far older than any monarch ever was a long wait, but he was never itching to get his hands on the leaves of power. He was incredibly conscientious about not briefing anything about his plans as king, because as soon as it would start leaking out because it would have looked like he was undermining the queen, but when the day came he was ready."

This follows news that suggests His Majesty's two-year-old reign is reportedly not shaping up to be like he expected, especially considering he was the longest-waiting heir in British history.

In fact, as the monarch still battles cancer, "executive power and influence is already flowing William's way," royal reporter Tom Sykes wrote.

One shift in this direction was reported to be Catherine, Princess of Wales' "cinematic" video in early September detailing the end of her chemotherapy treatments. Sykes shared how the video allegedly was not first approved by the King, which would have been unthinkable during Elizabeth II's reign.

He added, "To get away with such cheek showed William and Kate have an instinctive understanding... of how the power dynamic has shifted since the king’s diagnosis."

"In the latter decades of the late Queen's reign, you had Diana, Fergie, Kate and Meghan, pop up and steal the limelight for a time — but Elizabeth's hold over the public's imagination never once faltered," a palace insider spilled. "The same cannot be said for Charles because fate played a cruel trick on him."

They added, "William and Kate are a force to be reckoned with."

InStyle reported on Hardman's comments.