Answer:
Charles II (King of England - b. 1630 - d. 1684)- Cause of Death: Uraemic convulsions.
Contrary to what many people think, Charles II was a man of quite spare eating and drinking habits. The same cannot be said of his amorous disposition: he fathered at least fourteen illegitimate children. He probably died of kidney failure, aged 54, either from a chronic kidney disease or from mercury poisoning from the chemical experiments he liked to conduct in his laboratory. His gruelling deathbed, where all kinds of medical torture available at the time were employed by a gaggle of court physicians, was described in detail by many sources, as compiled in "The last days of Charles II" by Sir Raymond Henry Payne Crawfurd. A famous quote attributed to the king, that illustrates his sarcastic but extremely civil nature, has him apologising to the people that surrounded him on his death for taking "such an unconscionable time a-dying."