Tylos

Bahrain was referred to by the Greeks as Tylos. It was the centre of pearl trading, when "Nearchus" came to discover it serving under Alexander the Great. From the 6th to 3rd century BC Bahrain was in the Persian Empire. The Greek historian, Theophrastus, states that much of the islands were covered in cotton trees. Tylos was famous for selling walking canes that were carried in Babylon.
It is not known whether Bahrain was part of the Seleucid Empire. Alexander planned to settle the eastern shores of the Persian Gulf with Greek colonists. The upper classes spoke Greek. Tylos became a site of Greek athletic contests.
With the lessening of Greek power, Tylos was added into Characene or Mesenian. From the third century BC to the arrival of Islam in the seventh AD, Bahrain was controlled by two other Iranian dynasties of Parthians and Sassanids.