Alea Iacta Est Meaning: "The Die Is Cast", Who Said It and How the Sources Report It

Start hereSuetonius says Caesar paused at the river and said they could still turn back. Then he said the die was cast. Plutarch tells the same moment in Greek. Which words did Caesar use?

Alea iacta est is Latin for “the die is cast”. Suetonius gives the words as what Julius Caesar said at the river Rubicon, as he led his soldiers into Italy. Caesar crossed the Rubicon in January 49 BC.

In English, the phrase means a decision has been made and cannot be changed. This page goes word by word, then to the moment, the ancient reports and how people use it now.

011. The words, one by one

In Latin, alea is a game with dice, and more generally a game of chance. Iacta comes from the verb iacio, to throw or cast. Est means “is”.

Latin	What it means	In the phrase
alea	a game with dice; chance	the die
iacta	thrown, cast	cast
est	is	is

Together, iacta est is in the perfect tense. Bennett’s New Latin Grammar translates this tense as “I have been loved, or I was loved”, using the verb for love. So the phrase says the die has been thrown. The American Heritage Idioms Dictionary renders the Latin as “the dice have been thrown”.

Iacta or jacta? They are the same word. Bennett notes that the Romans, who wrote in capitals, used I for both the vowel and the consonant. Some later books write j for the consonant, as his grammar does. The 1911 Encyclopaedia Britannica prints the phrase as “Alea jacta est”.

Which word comes first? Suetonius’s word order is iacta alea est; the familiar alea iacta est reverses it. Our reading: both orders say the same thing.

The picture. Our reading: a die that has been thrown is still rolling. The choice is made, but the outcome is not yet known.

022. Who said it, and when

Suetonius calls the river “the boundary of his province”. Crossing it with his army in 49 BC began a civil war, as the American Heritage Dictionary puts it.

In Suetonius

Caesar pauses at the river and says they can still turn back.

Then a figure of “wondrous stature and beauty” appears, playing a reed pipe. It snatches a trumpet from a soldier and strides across to the far bank. Caesar says: “Take we the course which the signs of the gods and the false dealing of our foes point out. The die is cast”.

In Plutarch

Caesar halts and thinks a long time in silence, his mind going back and forth. He talks it over with the friends who are with him, among them Asinius Pollio. Then, “as if abandoning calculation and casting himself upon the future”, he speaks the words and crosses.

Our page on crossing the Rubicon tells the whole story of that night.

033. How the ancient writers report it

None of the three was born when Caesar crossed the Rubicon. Here is who tells it, and how.

Writer	When he lived or wrote	Language of the words	The words	Where
Suetonius	Wrote mainly in AD 98–138, it seems	Latin; he does not say what language Caesar spoke	Iacta alea est, “The die is cast”	Julius 32
Plutarch	Lived about AD 45 to 120	Greek, and Pompey 60 says Caesar spoke Greek	ἀνερρίφθω κύβος, “Let the die be cast”	Caesar 32.8; Pompey 60.2; also Sayings of Romans (Moralia 206C)
Appian	Writes of events “in my time” under the emperor Trajan	Greek; he does not say what language Caesar spoke	ὁ κύβος ἀνερρίφθω, “The die is cast: so let it be!”	Civil Wars 2.35

So there are two wordings, one Latin and one Greek. Plutarch and Appian give the same Greek saying. Only the word order differs, and Appian has one extra word, ὁ. Plutarch’s life of Pompey says Caesar was “calling out in Greek to the bystanders these words only”.

“Is cast” or “let it be cast”?

Perrin translates Plutarch’s Greek as “Let the die be cast”, a command rather than a report. White’s translation of Appian, whose Greek is the same saying, gives both: “The die is cast: so let it be!”.

The Greek dictionary of Liddell, Scott and Jones glosses it in Latin as jacta sit alea. Suetonius’s Latin, as printed, says the throw has already happened.

Lewis and Short’s 1879 Latin dictionary gives Caesar’s words, citing Suetonius, as Jacta alea esto, “Let the die be cast!” It points readers to the notes of two earlier scholars, Casaubon and Ruhnken.

The Loeb edition of Suetonius we read prints est, with no note on the word. A 1931 Loeb note to Plutarch’s Moralia gives Suetonius’s words as “iacta alea est or esto”.

Our reading: the sources do not settle which form, if either, Caesar used. Both are reports.

An older Greek saying

Plutarch calls it “the phrase with which men usually prelude their plunge into desperate and daring fortunes”. Appian, too, calls it a familiar phrase.

The same Greek saying turns up in a comedy by Menander, quoted by Athenaeus, where it is about getting married. Menander was an Athenian playwright of the late 300s BC. The line reads δεδογμένον τὸ πρᾶγμ· ἀνερρίφθω κύβος, “the thing’s decided; let the die be cast” (our translation). Plutarch does not name Menander.

Our reading: in Plutarch’s and Appian’s telling, Caesar reached for a well-known saying, not a new line.

What they could have known

These are all later reports. Caesar’s own account of the civil war does not mention the Rubicon. Asinius Pollio, whom Plutarch places at the river, later wrote a history of the civil wars. The 1911 Britannica says Plutarch and Appian used it as an authority. Almost all of his writing is lost.

Our reading: a witness’s account may lie somewhere behind the Greek version. We cannot check it, because it is gone.

044. How it is used today

Cambridge Dictionary says the die is cast is “said when a situation is certain to develop in a particular way because decisions have been taken that cannot be changed”.

The American Heritage Idioms Dictionary gives the example “Now that I’ve announced my resignation, the die is cast”. It says that in English the phrase dates from the first half of the 1600s.

Our reading: people say it after a step they cannot take back, while they wait to see how it turns out. It sits close to “crossing the Rubicon”, which names the step itself.

055. Easy mix-ups

• It is not veni, vidi, vici. Those three words belong to a later war, against Pharnaces near Zela in 47 BC. Our page on veni, vidi, vici: meaning and sources covers them.

• It is not “let fate decide”. Our reading: the person throwing has already chosen. Chance decides only how it lands.

• It is not from Caesar’s own book. As above, his account of the civil war never names the river.

Our page on famous Latin phrases looks at this line beside fourteen others. For more of his famous lines, see our Julius Caesar quotes page; for his whole life, see our Julius Caesar summary.

066. Try it yourself

Using the phrase. Our suggestion: say it after the decision, not before. If you can still back out, the die is not cast yet.

Checking a famous Latin line. Our suggestion, in four steps:

1. Find the ancient writer and the passage number. Here it is Suetonius, Julius 32.

2. Read the passage in the original and in a translation. We used LacusCurtius and the Perseus Digital Library.

3. Note four things: the exact words, the language, who reports them, and when he wrote.

4. If two writers disagree, keep both versions and say so.

07Quick answers

08Use this

09Quick quiz

How we checked this · Last checked October 2026

• We read Suetonius, Plutarch and Appian in the Loeb translations on LacusCurtius, and checked the Latin of Suetonius and the Greek of Plutarch and Appian.
• The word meanings come from Lewis and Short's Latin dictionary, the Greek lexicon of Liddell, Scott and Jones, and Bennett's New Latin Grammar.
• We looked for a primary text of Erasmus on the reading esto and could not open one, so we left him out.
• Our wording matches our pages on famous Latin phrases and on veni, vidi, vici.

How we check every article →

10Sources