When he heard this, Alexander ordered the leaders themselves to fight in single combat; to the one called Alexander he himself gave armour, and to the one called Dareius, Philotas. The army were spectators of the combat, counting the issue as in some measure an omen of the future. After a strenuous battle, the one called Alexander was victorious, and received as a reward twelve villages and the right to wear Persian dress. This, at any rate, is what we are told by Eratosthenes.
Edition :
Plutarch. Plutarch's Lives. with an English Translation by. Bernadotte Perrin. Cambridge, MA. Harvard University Press. London. William Heinemann Ltd. 1919. 7.