Santa Maria in Gradi is a Roman Catholic church in the town of Viterbo in the region of Lazio, Italy.
The Dominican convent was founded in 1244 with the patronage of the papal notary, Raniero Capocci, who had been a friend to Dominic de Guzmán, founder of the order and beatified in 1234.
The church of Santa Maria della Quercia in Viterbo also belonged to the Dominican order.
But Santa Maria in Gradi, standing outside the city walls, suffered more depredations during various conflicts, and was refurbished both in the 1400s and in the 1700s.
[1] Among those once buried in the church was Pope Clement IV (his tomb and monument were moved in the 18th-century to San Francesco, and the archbishop Ruggieri degli Ubaldini, who Dante assigns to the circle of traitors in the Inferno.