The Iliad, Book I, Lines 1-16

Anger be now your song, immortal one,
Akhilleus' anger, doomed and ruinous,
that caused the Akhaians loss on bitter loss
and crowded brave souls into the undergloom,
leaving so many dead men--carrion
for dogs and birds; and the will of Zeus was done.
Begin it when the two men first contending
broke with one another--
				    the Lord Marshal
Agamémnon, Atreus' son, and Prince Akhilleus.

Among the gods, who brought this quarrel on?
The son of Zeus by Lêto. Agamémnon
angered him, so he made a burning wind
of plague rise in the army: rank and file
sickened and died for the ill their chief had done
in despising a man of prayer.