There is no reliable information on when Hinduism began in Afghanistan but historians suggest that the territory south of the Hindu Kush may have been culturally connected with the Indus Valley Civilization (5500-2000 BC) in ancient times. At the same time, most historians maintain that Afghanistan was inhabited by ancient Arians followed by the Achaemenid before the arrival of Alexander the Great and his Greek army in 330 BC. It became part of the Seleucid Empire after the departure of Alexander three years later. In 305 BC, the Seleucid Empire lost control of the territory south of the Hindu Kush to the Indian Emperor Sandrocottus as result of the Seleucid-Mauryan War.Alexander took these away from the Arians and established settlements of his own, but Seleucus Nicator gave them to Sandrocottus (Chandragupta), upon terms of intermarriage and of receiving in exchange 500 elephants.