2. Which Titan, who deposed his father Uranus, and in turn was deposed by Zeus, was the leader of the Titans?
From Quiz Clash of the Titans
Cronus was the youngest of the original twelve Titans, and was the son of Uranus (the sky) and Gaia (the earth). He was married to one of his sisters, Rhea, and was the father of Zeus, Poseidon and Hades. After usurping the leadership from his father, he swallowed up his children in an attempt to prevent them from doing the same to him. However, Rhea saved Zeus from this fate, and once he grew up he led a rebellion against Cronus and the other Titans; this resulted in the banishment of most of the Titans to Tartarus, and the long-lasting reign of Zeus and his siblings from Mount Olympus.
Phoebe was one of Cronus's sisters, and Pallas and Atlas were two of his nephews.