Missionary and linguist, born in Canada, 1791; died there, 1855. Ordained 1813, he evangelized the Iroquois, first at Saint Regis, later at Caughnawaga. He acquired such proficiency in the Iroquois tongue as to attain a high rank among philologists through his Iroquois grammar and French-Iroquois dictionary. Father Marcoux translated into Iroquois, Father De Ligny's "Life of Christ," and published in that language a collection of prayers, hymns, and canticles, a catechism; calendar of Catholic ritual, and a number of sermons.