successor of Gerhard Groot as director of the Brethren of the Common Life (q.v.), was born at Leerdam in 1350. He became M.A. at time University of Prague, and on his return to Holland came under the influence of Gerhard, and became his close friend, and a leader among the Brethren. He died A.D. 1400. His life was written by Thomas A Kempis (Vita Florentii, in Opera Omniae, ed. 1635, volume 3). See Ullmann, Reformers before the Reformations, 2:82 sq. (See BRETHREN).