Syphilis is an infection caused by the bacterium Treponema pallidum. One of the symptoms of late or tertiary syphilis is delusion of grandeur or megalomania.
Idi Amin's doctor John Kibukamusakie revealed that Idi Amin was indeed suffering from "general paralysis of the insane" which is another name for a form of tertiary syphilis.
Sufferers all exhibit disorganized thinking, transient false beliefs, mental rigidity, and obsessive-compulsive repetitive behaviors.
Self-appointed and self-glorified "General" Than Shwe of Burma thinks he is a reincarnation of a Burmese king and it would be right to surmise that he is suffering from delusion of grandeur. As in Idi Amin's case only his personal physician Dr Paing Soe can confirm it, but given that this Paing Soe is a nephew of Kyaing Kyaing (Than Shwe's concubine) the truth may never be known.