George III: The Life and Reign of Britain's Most Misunderstood Monarch: Andrew Roberts (author) Hardback 800 Pages / Published: 07/10/2021 link
"Roberts' magisterial, revisionist biography of the controversial George III debunks much of the popular discourse about the monarch's incompetence and the nature of his mental state, painting a persuasive portrait of a shrewd and courageous leader." Also currently being read in abridged form on BBC Radio 4.
For a minute there I thought you were referring to Professor Roberts. I have to admit to a not inconsiderable disappointment.
I haven't read Robert's on Napoleon or George III, though I listened to the latter on BBC Radio 4. The description of his bipolar disorder with the episodes of deep depression, and final descent into insanity, were almost as harrowing as were the descriptions of the treatments he had to endure. I think the last biography I read on Napoleon was Georges Lefebvre's. No need for another one after that.
I suppose all the people who hated his Napoleon biography will love this one.