Faithfully devoted to the Staufens, Hermann III came in conflict with his relatives from Zähringen-Swabia.
In 1140 he participated in the siege of Weibtreu castle, and received the bailiwick of Selz in Alsace.
A deed of donation exists from 1153, that states Frederick I bought Castle Besigheim from Hermann III.
Hermann III fought in the first Italian campaign of Emperor Frederick I, and gained the title margrave of Verona.
[3] He married Bertha von Lothringen (d. after 1162), in 1134; she was the daughter of Simon I, Duke of Lorraine, and his wife Adelaide of Leuven.