At the Battle of Gaugamela, Darius used Indian troops against Alexander the Great. Later, Alexander's army fought the Indian army of King Porus at the Indian campaign of Alexander the Great. Plutarch wrote about the battle at his work "Parallel Lives", "Life of Alexander". The Indian King Ambhi (Greeks called him "Taxiles" in their scripts) supported Alexander with his forces. Philostratus the Elder in the "Life of Apollonius of Tyana" wrote that in the army of Porus there was an elephant who fought brave against Alexander's army and Alexander dedicated it to the Helios (Sun) and named it "Ajax", because he thought that a so great animal deserved a great name. The elephant had gold rings around its tusks and an inscription was on them written in Greek: "Alexander the son of Zeus dedicates Ajax to the Helios" (ΑΛΕΞΑΝΔΡΟΣ Ο ΔΙΟΣ ΤΟΝ ΑΙΑΝΤΑ ΤΩΙ ΗΛΙΩΙ). Alexander, also met and talked with Indian gymnosophists, including Dandamis and Kalanos.