Berthold I (c. 1060 – 18 May 1090), better known as Berthold of Rheinfelden, was the Duke of Swabia from 1079 until his death.
Berthold I (c. 1060 – 18 May 1090), more commonly known as Berthold of Rheinfelden, served as the Duke of Swabia from 1079 until his passing away.