Where does “beware of Greeks bearing gifts” come from?

Who said it

The speaker is Laocoön, a Trojan priest, in book 2 of the Aeneid, where Aeneas tells Queen Dido of Carthage how Troy fell. The Greek camp is ash, the fleet has vanished, and a giant wooden horse stands on the beach. While the Trojans argue over it, Laocoön runs down from the citadel with a crowd behind him and shouts, “Do you think that any gifts of the Greeks are free from treachery?” Then comes the line people still quote:

Whatever it be, I fear the Greeks, even when bringing gifts.

He drives his spear into the horse’s flank, and the hollow belly booms. Had the Trojans listened, Aeneas tells Dido, Troy would still be standing.

What the Latin says

The full line is quidquid id est, timeo Danaos et dona ferentes. Word by word: whatever it is, I fear the Danaans even bearing gifts. Danaos is one of Homer’s names for the Greeks, beside Achaeans and Argives. Et here means even, and dona ferentes, bearing gifts, describes the Greeks themselves. Laocoön is not warning against presents in general. He is saying these particular enemies are most dangerous when they look generous. English turned the line into “beware of Greeks bearing gifts,” and a Greek gift came to mean any present designed to do harm.

The serpents

Laocoön is right, and the gods silence him. While he sacrifices a bull to Neptune, two huge serpents swim across from the island of Tenedos and kill his two young sons and then the priest himself. The Trojans read it as punishment for striking a sacred offering and break open their own wall to drag the horse in. The older Greek poems tell it differently. In the Sack of Ilium, as Proclus summarizes it, the serpents kill Laocoön and one of his two sons after the horse is already inside, and the omen sends Aeneas’s people off to Mount Ida. Apollodorus says only that the serpents killed the sons, as a sign from Apollo. The horse itself has its own page: was the Trojan horse real?

The marble found in 1506

On January 14, 1506, digging in a vineyard on the Esquiline Hill in Rome uncovered a marble group of Laocoön and his sons in the serpents’ coils. Pope Julius II sent the architect Giuliano da Sangallo, who brought Michelangelo along, and soon bought it; it still stands in the Vatican Museums. Pliny the Elder described it in the house of the emperor Titus and named its makers, three sculptors from Rhodes: Hagesander, Polydorus and Athenodorus (Natural History 36.37).

Why a Roman wrote it

Virgil wrote the Aeneid between about 29 and 19 BC, under Augustus, more than seven hundred years after Homer. Rome claimed descent from Aeneas, the Trojan prince who carried his father out of the burning city, so Virgil told the fall of Troy from the losing side, with the Greeks as smooth deceivers and a priest who saw through them. That is how a warning in Latin became a proverb about Greeks, and how Troy became part of Rome’s own beginning: how was Rome founded?