The monument of Marquise Cristiana Duglioli Angelelli is set in the wall of the counterfaçade. This noble woman from Bologna was the widow of Senator Andrea Angelelli. After her husband's murder in 1643 she settled in Rome where she patronized the leading artists of the era. The marquise, who moved in the highest circles of the Roman society, established a famous art collection in her palace. She died in 1669 leaving some precious relics and alms to the monastery.

The monument is a simple slab of white marble in a grey marble frame. It is flanked by slim volutes and crowned with a strong architrave. The marble coat-of-arms of the Duglioli family rest on top of the lintel.