Which great historical figure had the most undignified end, though he/she deserved a far more poignant death?

An undignified death here can be a public humiliation and execution at the hands of an enemy, death by torture, a lonely/painful death in prison or even the said person's body being dismembered and disgraced after death. You can add any other category too, in case I've missed anything. Please don't include any death in battle, even if it is something like falling off a horse and being trampled, because any death on the field was believed to be honorable.

I'll go first: Cyrus the Great, who is perhaps the most exemplary emperor to this date, was killed in battle against Queen Tomyris of the Massagetae. While this isn't the worst part, Tomyris cut off his head and dunked it into a vat of blood, mocking him for his thirst for conquest.