Fulco was the first known missionary Bishop of Estonia. He was appointed in 1165 by Eskil, the Danish Archbishop of Lund. Before his appointment, Fulco was a Benedictine monk in the abbey of Moutier-la-Celle, near Troyes in France. His nationality is not known.
After his appointment, Fulco appears in sources only once. In 1171, Pope Alexander III asked the Archbishop of Trondheim to assign an Estonian monk Nicolaus living in Stavanger to go to Fulco's assistance. No further information survives about Fulco's work in Estonia, or whether he ever even got there.