Heinrich married Mechteld Van Guelders, [COUNTESS OF NAS before 1221. Mechteld (daughter of Otto I Count Guelders and Richardis Princess Of Bavaria, [COUNTESS OF GUE) was born about 1194 in Of, Zutphen, Gelderland, Netherlands; died after 1247 in Of, NASSAU, Hessen-Nassau, Prussia. [Group Sheet] [Family Chart]