The 500-year-old Roman Republic, which preceded it, had been weakened and subverted through several civil wars.[nb 2] Several events are commonly proposed to mark the transition from Republic to Empire, including Julius Caesar's appointment as perpetual dictator (44 BC), the Battle of Actium (2 September 31 BC), and the Roman Senate's granting to Octavian the honorific Augustus (4 January 27 BC).[nb 3] Roman expansion began in the days of the Republic, but the empire reached its greatest extent under Emperor Trajan: during his reign the Roman Empire controlled approximately 6.5 million km2[6] of land surface. Because of the Empire's vast extent and long endurance, the institutions and culture of Rome had a profound and lasting influence on the development of language, religion, architecture, philosophy, law, and forms of government in the territory it governed, particularly Europe, and by means of European expansionism throughout the modern world.
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