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.
References
Giovanni Battista Giustammiani Wikipedia(Text) CC BY-SA