In which circle of hell is Count Ugolino punished?

Count Ugolino is punished in the Ninth Circle of Hell, which is reserved for traitors. This circle is divided into four regions, and Ugolino resides in one of them called Cocytus, where those guilty of treachery against their kin, their country, or their benefactors suffer eternal torment.

In Dante's narrative, Ugolino's punishment is particularly gruesome; he is condemned to gnaw on the head of his former ally, Archbishop Ruggieri, as a representation of their betrayal. This poignant portrayal underscores the severity of betrayal in Dante's moral framework, highlighting how treachery is viewed as one of the most heinous sins. The Ninth Circle's icy landscape serves as a stark contrast to the other circles of Hell, emphasizing the coldness of betrayal.