Diepold III, Margrave of Vohburg
Diepold III, Margrave of Vohburg (c. 1079 – 1146), also known as Diepold von Vohburg and Diepold III von Giengen, was a Bavarian noble in the 12th century. He had two wives. His daughter with Adelaide of Poland (daughter of Władysław I Herman and Judith of Swabia), Adelheid of Vohburg, was the first wife of Frederick I, Holy Roman Emperor.
The title had originally referred to the families' holdings along the border with Bohemia, but after Diepold's death the title was transferred to the Bavarian lands proper of the family.