(b Fossombrone, 1589; d Pesaro, 1655–9). Italian painter. Apparently self-taught, he made copies after Federico Barocci. In 1606 he went to Rome and came under the influence of Caravaggio and his followers, above all of Orazio Gentileschi. He returned home, probably in 1614, and at this time produced his most important works, two paintings of the Miracles of St Nicholas of Tolentino (Sassoferrato, S Maria del Piano), in which the interpretation is realistic and the figures are monumental and strongly lit. During Guerrieri’s second visit to Rome, between 1615 and 1618, he worked for Marcantonio Borghese on the decoration of the newly built Palazzo Borghese on the Campo Marzo. Here he created a series of decorative frescoes and various overdoor paintings. The frescoes, eclectic and compositionally hesitant, reflect the growing influence of the Bolognese school, which by this time had begun to replace that of Caravaggio in Roman painting. After returning to the Marches, Guerrieri worked mainly on religious commissions. His last known work was a signed St Victor (1654; Urbino, Pal. Ducale). There are some surviving examples of his work as a portrait painter, for example Livia Feltro della Rovere (Urbino, Pal. Ducale). After an accident in which his wife and daughter were killed, he moved to Pesaro to live with his other daughter, Camilla Guerrieri (1628–64), who was also a painter.