“Haply thou deemst that the duke of Athens, by whom done to death wast thou in the upper world, draws near’ my sage, turn’d tow’rds him, cried”
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For those violent against others Virgil tells Dante to turn his eyes to the valley where he will see souls boiling in blood (people that were kings of bloodshed and despoilment). The river of blood is called Phlegethon and the souls in it are standing in a depth according to their sin — the worse the sin, the deeper they stand in the river. The Minotaur (Greek Mythology. a monster with the body of a man and the head of a bull (in some versions, with the body of a bull and the head of a man), confined by Minos in a labyrinth built by Daedalus, and annually fed seven youths and seven maidens from Athens, until killed by Theseus) is a perfect guardian for the sinners of the seventh circle because of his bestial and violent nature.