Giovan Battista Giustammiani

Giovanni Battista Giustammiani, also called il Francesino (active 1608 to 1643) was a French-Italian painter active mainly painting sacred subjects in a late-Mannerist style in Siena, Tuscany, Italy.

He painted the Miracles of Benedictine Saints for the sacristy of San Domenico. He also painted a glory of angels for the Sacristy of the Siena Cathedral. He painted an altarpieces depicting the Circumcision of Jesus for the church of San Raimondo. He painted a Saint Dominic in Soriano for the Propositura di Santa Croce (), Greve in Chianti, Tuscany; now in the Museum of Saint Francis, Greve in Chianti.

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