Pietro Giovanni Guarneri (1655–1720), also known as Pietro da Mantua or Peter Guarnerius of Mantua was a violin maker of the Guarneri family who also worked as a professional musician. Today his instruments are highly regarded, though quite rare. They are played by musicians such as Joseph Szigeti.
Pietro Guarneri was the eldest son of the master luthier Andrea Guarneri and Anna Maria di Orcelli, born in Cremona, Italy on the 18th of February 1655. Although the exact date he began working in his father's workshop is unknown, experts have found traces of his workmanship beginning about 1670 in instruments labeled as Andrea Guarneri. His work appears in many instruments between 1670 and 1678, and some seem to be wholly his own work though, unlike his younger brother Giuseppe filius Andrea Guarneri, he never used his own label while working with their father. His early work shows not only promising ability and craftsmanship, but also a pronounced tendency to express his own personality and follow his own ideas. He quickly developed his own style, noticeable in its distinctive f-holes, precise corners and purfling, and a fuller arching than his father used. Evidence from his father's will indicates that father and son did not work together in the family workshop harmoniously, and Pietro left Cremona altogether in 1679, eventually establishing himself in Mantua.
In 1677 Pietro married Caterina Sassagni, and they had a son in the following year. In 1694, he appears in the census in Mantua as having remarried to Lucia Guidi, and having five children, none of whom followed their father into violin making.
Even while he was in Cremona violin making was not his only interest. He also developed himself as a violin and viol player. By 1685, he was accomplished enough to perform for the Duke of Mantua as a violin soloist, and play a viol in the Mantuan Court Orchestra. His musicianship is unique among the great Italian violin makers of the classical period. He is the only one who left any record of musical ability, and certainly the only one who pursued both violin making and performing professionally. He also appears to be the earliest known violin maker in the city of Mantua, though doubtless there were many viol and lute makers. The city was already famous for its music, being home to the composer Monteverdi and Duke Vincenzo I of Gonzaga, a composer and patron of the arts. Singular as his musical achievements may have been, they sadly resulted in Pietro making few instruments. Today not more than fifty of his violins are thought to exist, and there are no known violas or violoncelli.*