Julius Caesar Crosses the Rubicon, Igniting Roman Civil War
On January 11, 49 BCE, Julius Caesar led the Thirteenth Legion across the Rubicon River, the legal boundary he was forbidden to cross with an army. According to Roman historian Suetonius, he is said to have declared “alea iacta est” — “the die is cast” — as he advanced toward Rome. The move directly defied the Roman Senate and his rival Pompey, plunging the Republic into a brutal civil war. Caesar’s gamble ended the old republican order and cleared the way for the rise of the Roman Empire.