Augustus Caesar was the first emperor of Rome, ruling from 27 BC until his death in AD 14. Born Gaius Octavius, he was Julius Caesar's great-nephew and adopted son. After Julius Caesar's assassination in 44 BC, the teenage Octavius eventually defeated his rivals and transformed Rome from a republic (where elected officials shared power) into an empire (where one person held supreme authority).

Augustus brought peace after decades of civil war, a period Romans called the Pax Romana, or “Roman Peace.” He reorganized the government, rebuilt Rome's infrastructure, and expanded the empire's borders. During his reign, Rome flourished: new roads connected distant provinces, trade prospered, and poets like Virgil and Horace created masterpieces. The month of August is named after him.

Augustus was clever about power. Rather than calling himself king (which Romans hated), he took the title Augustus (meaning “revered one”) and maintained the appearance that the Senate still mattered, even though he controlled the army and made the real decisions. His 40-year reign established a system that would last for centuries. When Christians read that Jesus was born “when Caesar Augustus issued a decree,” they're reading about this same emperor, whose census brought Mary and Joseph to Bethlehem.