Wikipedia
Démophon
Démophon is a French-language opera by the composer Johann Christoph Vogel, first performed at the Académie Royale de Musique (the Paris Opera) on 15 September 1789. The libretto is by Philippe Desriaux. The second and last of Vogel's operas to be staged, it was premiered after the composer's death at the age of 32 the previous year.
Demophon (seer)
Demophon was a seer in Alexander's entourage. The King ignored Demophon's prediction of danger before the attack on the Mallian town in India in 325 BC. Demophon was one of several men who slept in the alleged temple of Serapis at the time of Alexander's fatal illness.