Much of Greek learning was assimilated by the nascent Roman state as it expanded outward from Italy, taking advantage of its enemies' inability to unite: the only real challenge to Roman ascent came from the Phoenician colony of Carthage, and its defeat in the end of the 3rd century BCE marked the start of Roman hegemony. First governed by kings, then as a senatorial republic (the Roman Republic), Rome finally became an empire at the end of the 1st century BCE, under Augustus and his authoritarian successors. The Roman Empire had its centre in the Mediterranean Sea, controlling all the countries on its shores; the northern border was marked by the Rhine and Danube rivers. Under emperor Trajan (2nd century AD) the empire reached its maximum expansion, controlling approximately 5,900,000 km² (2,300,000 sq mi) of land surface, including Britain, Romania and parts of Mesopotamia. The empire brought peace, civilization and an efficient centralized government to the subject territories, but in the 3rd century a series of civil wars undermined its economic and social strength. In the 4th century, the emperors Diocletian and Constantine were able to slow down the process of decline by splitting the empire into a Western and an Eastern part. Whereas Diocletian severely persecuted Christianity, Constantine declared an official end to state-sponsored persecution of Christians in 313 with the Edict of Milan, thus setting the stage for the empire to later become officially Christian in about 380 (which would cause the Church to become an important institution).
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