After assuming control of government, Caesar began a program of social and governmental reforms, including the creation of the Julian calendar. He gave citizenship to many residents of far regions of the Roman Republic. He initiated land reform and support for veterans. He centralized the bureaucracy of the Republic and was eventually proclaimed "dictator for life" (). His populist and authoritarian reforms angered the elites, who began to conspire against him. On the Ides of March (15 March), 44 BC, Caesar was assassinated by a group of rebellious senators led by Brutus and Cassius, who stabbed him to death. A new series of civil wars broke out and the constitutional government of the Republic was never fully restored. Caesar's great-nephew and adopted heir Octavian, later known as Augustus, rose to sole power after defeating his opponents in the last civil war of the Roman Republic. Octavian set about solidifying his power, and the era of the Roman Empire began.