Around 325 BC, Alexander the Great sent his top admiral, Androsthenes of Thasos, to survey the entire Persian Gulf. The requested charts arrived shortly after Alexander died in 323. Seleucus I Nicator was awarded the eastern part of the Ancient Greek Empire after Alexander's death. Starting from 312, he expanded the Seleucid Empire eastward of Babylon, purportedly encompassing parts of Eastern Arabia. Archaeological evidence of Greek-influenced materials has been discovered in Qatar. Excavations north of Dukhan uncovered potsherds of Seleucid characteristic, and a cairnfield consisting of 100 burial mounds dating to the era was discovered in Ras Abrouq. The relatively large number of cairns suggest a sizeable sea-faring community prevailed in the area.