Frederick I, Holy Roman Emperor
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. Their son Diepold IV died in 1130.