Henry I of Nassau-Siegen

Henry I (c. 1270–1343), Count of Nassau-Siegen and eldest son of Count Otto I, succeeded his father in 1290. He backed his cousin Adolf of Nassau's election as German king in 1292, fighting for him in Thuringia and at Göllheim in 1298, where Adolf was killed. Adolf had pledged him the Ratzenscheid silver mines, the basis of the Nassau mining rights.

The 1303 partition of Nassau gave him Siegen, and in 1306 he gained Dillenburg. He died in 1343, succeeded by his son Otto II.