Catello di Rosso Gianfigliazzi

Castello di Rosso Gianfigliazzi was a Florentine nobleman who lived in the late 13th century around the time of Giotto and Dante.

He practiced usury in France and was made a knight upon his return to Florence.

In Dante Alighieri's Divine Comedy poem Inferno, Dante says that he saw Catello in the inner ring of the Seventh Circle of Hell, where the violent are eternally punished.

The inner ring of the Seventh Circle is a burning hot desert with a continual rain of fire.

This, and a bit of research into Dante's time-period, make it possible to identify who the suffering sinners are meant to be.