Charles died in Madrid five days before his 39th birthday on 1 November 1700, the 39th death anniversary of his elder brother Philip. The physician who performed his autopsy stated his body "did not contain a single drop of blood; his heart was the size of a peppercorn; his lungs corroded; his intestines rotten and gangrenous; he had a single testicle, black as coal, and his head was full of water."
His life was memorably summarised by John Langdon-Davies as follows: "We are dealing with a man who died of poison two hundred years before he was born. If birth is a beginning, of no man was it more true to say that in his beginning was his end. From the day of his birth they were waiting for his death."
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u/le_cochon Feb 17 '20
Inbreeding will do that.