c. 1360-1431. Dutch mystic, associated with the Brethren of the Common Life.* Born in Dordrecht, well educated, for a time in the service of Count Willem VI of Holland, he was influenced by the fiery preaching of G. Groote,* and in his thirties joined the Brethren as a lay brother in their cloister at Windesheim. This remained his base for the remainder of his life, spent in conducting various business affairs for the Brethren, and also in compiling several treatises on mysticism. These are taken largely from the thoughts and writings of the famed Flemish mystic, ,* and are thus theologically orthodox.