The Trojan horse was a Greek horse used to fool the Trojans around 1250BC. Ulysses freed Queen Helen of Sparta from Prince Paris of Troy by building a hollow wooden horse and hiding in it.
The goddess Athene gave Ulysses the plan to help end the ten-year war between Greece and Troy.
Ulysses tricked the Trojans to take the wooden horse inside the city thinking the Greeks had abandoned the war.
Ulysses and his men crept out of a secret door in the belly of the horse when the Trojan soldiers were asleep. They killed the sleeping Trojans and rescued Queen Helen.