Giovanni Francesco BARBIERI known as the GUERCHIN (Cento 1591 - Bologna 1666) Saint Augustine, reading in an interior Sanguine. (Small holes restored at the bottom, small folds). 26.5 x 20 cm Provenance : - Former G. Vallardi collection, stamped lower left (Lugt 1223). - Former C. Prayer collection. Prayer, stamped lower right (Lugt 2044) and mounted with a black band. We would like to thank Mr. David M. Stone for kindly confirming the authenticity of this drawing based on a photograph. He dates the drawing to the 1640s or early 1650s.