Who is the Titan who overthrew his father Uranus?

The Titan who overthrew his father Uranus was Cronus.

In Hesiod's Theogony, Uranus—the personification of the Sky—imprisoned several of his children, including the Cyclopes and Hecatoncheires, causing Gaia, the Earth, to suffer. Gaia fashioned an adamantine sickle and urged her children to rebel. Cronus, the youngest of the twelve Titans, was the only one willing to attack. He ambushed Uranus, castrated him with the sickle, and seized control of the cosmos.

Cronus then ruled as the chief Titan and was linked with the mythological Golden Age. His victory contained the seed of another succession: Uranus and Gaia warned that Cronus would himself be overthrown by one of his children. Fearing that prophecy, he swallowed the children born to Rhea. Rhea saved Zeus by substituting a stone wrapped in cloth, allowing Zeus to grow up secretly in Crete. Zeus later forced Cronus to disgorge his siblings, and the Olympians defeated the Titans in the ten-year Titanomachy. Cronus was eventually associated with the Roman god Saturn.