Tartarus

Tartarus
Tartarus is the primordial Greek god who rules the infamous pit of the same name. The pit of Tartarus in the depths of the Underworld was used as a prison by the primordial gods, then the titans and then by the olympian gods. Tartarus has had many inhabitants over the years. Ouranos imprisoned the Hundred-Handed Ones, the Cyclopes and the Titans, in fear that they would betray him. Later, after freeing them, Kronos again imprisoned the Hundred-Handed Ones and Cyclopes. And Later, after again freeing the Hundred-Handed Ones and Cyclopes, Zeus imprisoned many of the Titans and their allies. Few mortals reside their, only those who do things dispicable and unforgivable. Sisyphus, Tantalus and Ixion being a few of these mortal residents. Tartarus himself plays little role in myth, but the pit that he rules is mentioned constantly.