When was Alea Jacta Est created?

The phrase "Alea Jacta Est" is a Latin phrase meaning "The die is cast". It is attributed to Julius Caesar, who is said to have uttered it upon crossing the Rubicon in 49 BCE, marking the start of the Roman Civil War.

So, the phrase itself was likely created around 49 BCE.

However, it's important to note that there's no contemporary written record of Caesar actually saying it. The first known mention of the phrase is in Plutarch's *Life of Caesar*, written around 100 AD.