Siegfried III, Count of Weimar-Orlamünde

Siegfried III (c. 1155–1206) ruled as count of Weimar-Orlamünde from 1172. The son of Herman I and grandson of Albert the Bear, he backed the Hohenstaufen emperors and stood with the princes against Henry the Lion until the Welf duke's overthrow in 1180.

He married Sophie, a daughter of King Valdemar I of Denmark, and spent long periods at the Danish court. He died in 1206, leaving two sons, Albert II and Herman II.