Sculptor. He was born in Paris as son of Pierre Legros the Older who had worked on decorating the castle of Versailles. His mother, Jeanne Marsy, as well as his stepmother, Marie Le Pautre, came from parisian artist families. He was taught to sculpt by his father and to draw by his grandfather Jean Le Pautre. In 1690 he went to Rome to study at the french Academy there and to meet with his cousin Pierre Le Pautre. In 1695 he was commissioned to create sculptures for an altar over the tomb of St Ignatius of Loyola in Il Gesù following a general concept by Andrea Pozzo. In the same year he left the french Academy and moved into his own workshop in the Palazzo Farnese which he used until his death. Until the Holy Year 1700 he was able to finish the statues as well as a silver statue of St Ignatius for the same altar, an altar for St Luigi Gonzaga at Sant'Ignazio di Loyola and a magnificent sarcophagus for Pius V at Santa Maria Maggiore. In 1700 he became member of the Accademia di San Luca. In 1704, after the death of his first wife, he married Marie Charlotte, daughter of René-Antoine Houasse, director of French Academy in Rome. Through this marriage he was brother-in-law of Nicolas Coustou. He sculptured two colossal statues depicting the apostles Bartholomew and Thomas for San Giovanni in Laterano as well as the monument for Ludovico Ludovisi and his uncle Gregory XV. From 1713 on he slowly lost favor of the Jesuits and after his fathers death in 1714 he returned to Paris where he hoped to find more acceptance. With his hopes disappointed he returned to Rome in 1716 where he protested against new rules set by the Accademia di San Luca and was excluded from membership. This meant that he was unable to take further public commissions in the city. Until his death he did some work in Torino. Six years after his death he was rehabilitated and reinstated as member of the Accademia.