Note:  Do not rely on this information. It is very old.

Damocles

Damocles, a courtier, companion, and parasite of the elder Dionysius, tyrant of Syracuse, who, having grossly flattered the monarch on one occasion, found at a magnificent banquet subsequently given in his honour a sword suspended above him by a single hair. The tyrant thus reminded him, that "uneasy lies the head that wears a crown."