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He was on the way to suppress a revolt in Swabia when he was murdered on 1 May 1308, at Windisch on the Reuss River, by his nephew Duke John, afterwards called "the Parricide" or "John Parricida", whom he had deprived of his inheritance.
Upon the death of King Louis the Child, Conrad was elected King of the East Frankish kingdom on 10 November 911 at Forchheim by the rulers of Saxony, Swabia (Alamannia) and Bavaria.
Ernest and Gisela had two sons, Ernest and Hermann, both of whom would eventually become dukes of Swabia themselves.
During the First World War, the Prince was active as a volunteer in the military hospitals as well as the General Delegate to the Eastern Front and Imperial Commissioner and military inspector.