Herman I, Count of Weimar-Orlamünde

Herman I (c. 1130–1176) founded the Weimar-Orlamünde branch of the House of Ascania, a son of Albert the Bear. During his father's lifetime he was entrusted with the family's administration in Thuringia, and he appears in documents as count from 1167.

In his feud with Landgrave Louis III of Thuringia, Weimar Castle was destroyed in 1174. He died on 19 October 1176, and his son Siegfried III succeeded him.