[5] His first patron was Pierre Guérin de Tencin, bishop of Embrun, who in 1724 commissioned a painting representing the ceremony of his investiture, now lost.
[5] From that time on, Étienne began to receive regular and numerous commissions, as he was skilled in both oil painting and fresco painting and became particularly well known for his works on religious themes, destined for churches in Rome and its surrounding area and churches in southern France.
[5] His paintings with religious subjects include: Saint Gregory at the poor man's table (1729; Rome, San Gregorio a Ponte Quattro Capi), Nativity (1739, Rome, Basilica of Santa Maria in Trastevere), Trinity (1739, for the dome of Santa Maria Maddalena in Rome), two paintings for the altars of Carpentras Cathedral (1744; Saints Augustine and Bernard in situ and Saints Joseph and Dominic gone lost) and The Incredulity of Saint Thomas (1758; Spoleto, Municipal Picture Gallery),[5] the painting for the high altar of the church of Santa Maria in Monticelli and the one for the high altar of the church of San Luigi di Francia, representing the apotheosis of Joan of Valois, founder of the order of the Annunziata.
[6] In addition to religious subjects, he also painted portraits such as that of Pierre Guérin de Tencin, engraved by Johann Georg Wille, and those of Cardinals Giovanni Battista Spinola, Melchior de Polignac, Pompeo Aldrovandi and Corsini.
[8] Instead, according to Parrocel (pg.83) and the Grove Dictionary of Art, Étienne was born in 1696 and never made etchings.