Alea iacta est, iulius cezar, suetonius, suetonius, rubicon
Alea iacta est is a Latin expression meaning: The die has been cast; it was attributed to Suetonius when speaking with Julius Caesar, on January 10, 49 BC as he was leding his army across the River Rubicon in Northern of Italy. His gesture - entering in Italy, leading his army, was considered an act of defiance towards the leadership of Pompey and began his long civil war against Pompey and the Optimates.
The modern meaning of phrase refers to a assumed risks, to a momentous decision and entering into a risky endeavor where the outcome is left to chance.
Even if the phrase is used in this form, the expression is wrong, the correct form is Iacta alea est.