an Italian prelate and theologian, was born at Lerma, a diocese of Genoa, in 1578. His father changed his original name of Turanchetti for that of Giustiniani, having been adopted by a family of that name, not wishing to take part in the conspiracy of Luigi Fieschi. In 1597 he entered the congregation of St. Philip of Neri. and was placed in charge of the library of Santa Maria de Vallicelli, and he there formed a taste for study. In 1616 he was appointed bishop of Ajaccio, at which place he died, January 3,1627. He wrote Index Universalis Materiarum Bibliocarum (Rome, 1612). This work contains many bibliographical errors. He also wrote other works. See Hoefer, Nouv. Biog. Generale, s.v.