Gaillard Jacques, a French Protestant theologian, was born at Montauban towards 1620. He became professor of philosophy in the Protestant academy of that city, but in 1659, certain disorders arising in the schools, he was expelled from Montauban, and resolved to quit the country. He went to Holland, and in 1662 became pastor of the Walloon church of Bois-le-Duc. He was subsequently director of the College of Leyden, and afterwards professor of theology in the university. He wrote Genealogia Christi, cum enodatione difficultatum quae occurrunt in evangeliis Matthaei et Lucae (Leyden, 1683, 8vo): — Melchisedecus Christues, unus rex justitiae et rex pacis, seu exercitationes xii de Melchisedeco (Leyd. 1686, 8vo). See E. Benoit, Hist. de 1'edit de Nantes (3, pages 320-322; Bayle, Nouv. de la Republique des Lettres (1684); Haag, La France Protestante, s.v.