Libya–European Union relations known as Cyrenaica. The Greeks of the Pentapolis resisted encroachments by the Ancient Egyptians from the East, as well as by the Carthaginians from the West, but in 525 BCE the Persian army of Cambyses II overran Cyrenaica, which for the next two centuries remained under Persian or Egyptian rule. Alexander was greeted by the Greeks when he entered Cyrenaica in 331 BCE, and Eastern Libya again fell under the control of the Greeks, this time as part of the Ptolemaic Kingdom. The Carthaginian Empire rose to power to hold sway over the coast of much of modern-day Libya, but
Tripoli passed into the hands of the rulers of Cyrenaica (a Greek colony on the North African shore, east of Tripoli, halfway to Egypt), although the Carthaginians later wrested it from the Greeks. By the latter half of the 2nd century BC it belonged to the Romans, who included it in their province of Africa, and gave it the name of "Regio Syrtica". Around the beginning of the 3rd century AD, it became known as the Regio Tripolitana, meaning "region of the three cities", namely Oea ("i.e.", modern Tripoli), Sabratha and Leptis Magna. It was probably raised to the rank of