Alea iacta est ("The die is cast") is a variation of a Latin phrase (iacta alea est) attributed by Suetonius to Julius Caesar on 10 January 49 BCE, as he led his army across the Rubicon river in Northern Italy. With this step, he entered Italy at the head of his army in defiance of the Senate and began his long civil war against Pompey and the Optimates. The phrase, either in the original Latin or in translation, is used in many languages to indicate that events have passed a point of no return.

Source: Wikipedia