Who became the jailers of the Titans in Tartarus after the war?

The Hecatoncheires became the jailers of the defeated Titans in Tartarus after the war.

The Hecatoncheires—Cottus, Briareus, and Gyges—were ancient giants born to Uranus and Gaia. Uranus had imprisoned them, and Cronus later kept them confined. Zeus released them when he needed powerful allies against the Titans during the Titanomachy.

Their help was decisive. With their many arms, they hurled huge rocks at the Titans while Zeus used his thunderbolts. After the Olympians won, Cronus and many of the defeated Titans were imprisoned in Tartarus, the deep underworld region reserved for dangerous divine enemies.

The exact wording differs among ancient sources. Hesiod places the Hundred-Handers near the bronze gates of the Titans’ prison and describes them as Zeus’s trusted guardians; Apollodorus makes their role as warders more explicit. Thus Hecatoncheires is the standard quiz answer, although the custodial detail is clearer in some versions than in others.