During the classical era, Bahrain was referred to by the ancient Greeks as ''Tylos'', the centre of pearl trading, when the Greek admiral Nearchus serving under Alexander the Great landed on Bahrain. Nearchus is believed to have been the first of Alexander's commanders to visit the island, and he found a verdant land that was part of a wide trading network; he recorded: "That on the island of Tylos, situated in the Persian Gulf, are large plantations of cotton trees, from which are manufactured clothes called ''sindones'', of strongly differing 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 Bahrain was covered by these cotton trees and that Bahrain was famous for exporting walking canes engraved with emblems that were customarily carried in Babylon.