Franz Liszt's Symphony to Dante's Divina Commedia (1856) has a "Purgatorio" movement, as does Robert W. Smith's The Divine Comedy (2006).
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In the poem, Purgatory is depicted as a mountain in the Southern Hemisphere, consisting of a bottom section (Ante-Purgatory), seven levels of suffering and spiritual growth (associated with the seven deadly sins), and finally the Earthly Paradise at the top.
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Further down the terrace, Hugh the Great personifies greed for worldly wealth and possessions.
His didactic poem, L’ensenhamen d’onor, and his love songs and satirical pieces have little in common with Dante's presentation, but the invective against negligent princes which Dante puts into his mouth in the 7th canto of the Purgatorio is more adequately parallelled in his sirventes-planh (1237) on the death of his patron Blacatz, where he invites the princes of Christendom to feed on the heart of the hero.
Shea has created a fictional scenario to explain this failure, and his firmly historical figures (such as Aquinas) are set side-by-side with wholly fictional characters and semi-legendary figures such as the Italian poet Sordello, who appears in Dante's Purgatorio and whom Shea has also taken considerable poetic license with.