A bishop saint pointing to a model city and other figures. Etching by F. Bartolozzi, 1764, after G.F. Barbieri, il Guercino.

Possibly Saint Petronius pointing to a model of the city of Bologna held by a putto, and looking up towards the Virgin, while a Bolognese woman, for whom he is interceding, stands next to him in despair. Identified in the Royal Collection catalogue as Saint Prosper, bishop of Reggio Emilia with a model of the city of Reggio