AHEM!Stacey steps forward, waving her Psychology Degree. (Yes, I do have one--oh no, please stop groaning, I promise to be gentle!
).
I don't think Henry was bipolar. He didn't have the dramatic manias (highs) of someone with BP (short for bipolar disorder). He could be very merry and high-spirited with his friends, but fortunately that does not count as mania! Because believe me, mania can be extremely destructive--not to others, but to the person suffering from it. (Manics can, for example, go on ruinous spending binges that can leave them virtually penniless, in extreme cases.) Yes, Henry spent tons of money, but he was a king! And yes, he could fall into black depressions, but these usually had a clear trigger--such as marital/fertility problems, pain from his ulcerous leg, etc. Bipolar depressions often seem to "come out of nowhere".)
Personality disorder? Yes, I think Henry probably
would qualify here. He certainly (esp. later in life) displayed paranoid traits. So there are possible signs of a paranoid personality disorder--or at least some paranoid personality traits. Histrionic personality disorder? Umm...maybe. He
was given to a lot of "peacock" displays and had plenty of vanity. I would say more "histrionic traits" than full-blown disorder I think. Borderline? He did engage in a lot of black-and-white thinking, and Lord knows he had massive rages, but I'm not sure I would classify him as having Borderline personality disorder. For example, I don't see the terrible fear of abandonment or the self-harming behaviors common to borderlines.
The one I think fits him best is Narcissistic Personality Disorder. Henry had a massively overgrown ego and he was almost totally self-absorbed. He truly thought that everything revolved around him. He could be ruthless with anyone who harmed his imagine of himself or who stood in his way. There is a more extreme kind of narcissism known as "Malignant Narcissism"---that is how many psychiatrists would diagnose a Hitler, a Stalin, or a Saddam Hussein. People whose narcissism and egotism are so enormous that they lose all sense of restraint and all morality.
I don't think Henry went quite that far--altho he came pretty close sometimes. (He had that bad habit of beheading wives and friends who crossed him, after all.) But I would say severe Narcissistic Personality Disorder fits Henry pretty well.
Having said all that...I must add the usual disclaimer and add that while I do have a degree in psychology, I am not a doctor. And even a licensed psychiatrist or psychologist would hesitate to "diagnose" someone so far removed in time and place.
Still....I think our Henry was a Narcissist....with a capital "N"!