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 "," and published in that language a collection of prayers, hymns, and canticles, a catechism; calendar of Catholic ritual, and a number of sermons.
New Catholic Dictionary