The Italian Peninsula, named Italia, was consolidated into a single entity during the Roman expansion and conquest of new lands at the expense of the other Italic tribes, Etruscans, Celts, and Greeks. A permanent association with most of the local tribes and cities was formed, and Rome began the conquest of Western Europe, Northern Africa and the Middle East. In the wake of Julius Caesar's rise and death in the first century BC, Rome grew over the course of centuries into a massive empire stretching from Britain to the borders of Persia, and engulfing the whole Mediterranean basin, in which Greek and Roman and many other cultures merged into a unique civilisation. The long and triumphant reign of the first emperor, Augustus, began a golden age of peace and prosperity. Italy remained the metropole of the empire, and as the homeland of the Romans and the territory of the capital, maintained a special status which made it "not a province, but the "Domina" (ruler) of the provinces". More than two centuries of stability followed, during which Italy was referred to as the "rectrix mundi" (queen of the world) and "omnium terrarum parens" (motherland of all lands).