The gens Curtia was an ancient but minor noble family at Rome, with both patrician and plebeian branches. The only member of the gens invested with the consulship under the Republic was Gaius Curtius Philo, in 445 BC. A few Curtii held lesser magistracies during the Republic, and there were two consuls suffectus in imperial times. However, the gens is best remembered from a series of legends dating from the traditional founding of the city to the early Republic.
According to legend, Mettius Curtius was a leader of the Sabine forces who attacked Rome following the Rape of the Sabine Women. The first blows were exchanged between Curtius and the Roman warrior, Hostus Hostilius. After fierce fighting, Hostilius was slain and the Romans retreated, pursued by Curtius. Just then, the Roman King, Romulus, led his best troops against Curtius' advance. Pursued by the Romans, Curtius' horse was frightened by the shouting and plunged into the swamps, becoming mired in shallow water. Only with great effort was he able to free himself. Afterward, this stretch of water became known as the Lacus Curtius. In later times, the Lacus Curtius was drained and became part of the Roman Forum. Curtius' narrow escape is depicted on a relief, excavated in 1553 between the Column of Phocas and the Temple of Castor and Pollux, which seems to be a copy of an original dating perhaps to the 2nd century BC.
Besides the story of Mettius Curtius, two other legends derive the name of the lacus from later Curtii. In one account, the ground in the Forum gave way, and a youth named Marcus Curtius sacrificed himself by leaping in, fully armed and mounted on horseback, in order to fulfill a prophecy claiming that the chasm could be closed only by sacrificing that upon which Rome's future greatness would rest. The third legend states that the spot had been struck by lightning, and that on the Senate's orders, it was enclosed by the consul Gaius Curtius Philo. The story of Mettius Curtius may shed some light on the origin of the Curtia gens; it implies that the Curtii were of Sabine origin.