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.[1]
He painted a Saint Dominic in Soriano for the, Greve in Chianti, Tuscany; now in the Museum of Saint Francis, Greve in Chianti.[2]