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
Names of the Greeks revolved around Roman imperial rights. Unable to deny that an emperor did exist in Constantinople, they sufficed in renouncing him as a successor of Roman heritage on the grounds that Greeks have nothing to do with the Roman legacy. In 865, Pope Nicholas I wrote to the Emperor Michael III: "You ceased to be called 'Emperor of the Romans' since the Romans, of whom you claim to be Emperor, are in fact according to you barbarians." Henceforth, the emperor in the East was known and referred to in the West as "Emperor of the Greeks" and their land as "Greek