Bahrain was referred to by the Greeks as Tylos, the centre of pearl trading, when Nearchus came to discover it serving under Alexander the Great. From the 6th to 3rd century BCE Bahrain was included in Persian Empire by Achaemenians, an Iranian dynasty. The Greek admiral Nearchus is believed to have been the first of Alexander's commanders to visit this islands, and he found a verdant land that was part of a wide trading network; he recorded: That in the island of Tylos, situated in the Persian Gulf, are large plantations of cotton tree, from which are manufactured clothes called sindones, a very different degrees of value, some being costly, others less expensive. The use of these is not confined to India, but extends to Arabia. The Greek historian, Theophrastus, states that much of the islands were covered in these cotton trees and that Tylos was famous for exporting walking canes engraved with emblems that were customarily carried in Babylon. Ares was also worshipped by the ancient Baharna and the Greek colonists.