Ranieri, studied at Antwerp in the workshop of Abraham Janssens. Presumably about 1615 he went to Rome, where he became friends with caravaggisti, especially Manfredi, who is sometimes credited with his works. In addition, he met with a University that had a strong influence on him ("portrait of a musician", Grenoble, Museum of fine arts; "IG - rocky cards", Budapest, Museum of fine arts, "SV. Sebastian", Rouen Museum of fine arts, St. Petersburg, GOS. The Hermitage, "David", Rome, Gal. Decay; and caravaggesque his work, "Christ at Emmaus", Potsdam, New Palace). In 1625 or 1626 Ranieri leaves Rome and moves to Venice, where he lives until the end of life.
Among the first works painted in Venice, should be called two "Allegories" for the Royal Palace in Turin (1626). However, away from the Roman culture of his genius was fading under the influence of painting Emilia its original caravaggism softened, he paints pictures on historical and mythological subjects, his decorative paintings we see girls, solemnly dressed in stage clothes ("Death of Sophonisba", new York, private collection , Stuttgart, the State. gallery; the "Magdalen", Birmingham, Mountains. Museum). His pictures are sometimes captivating, but often they are awkwardly expressed; traces of it first, caravaggesque period appear in the shaded contours and clarity of the figures. His four daughters were his students. One of them married Daniel van Dyck, and the other for Pietro della Vecchia.