SOURCE-14090Research NeededProbable
Cawley, Charles, 'Chapter 3D: Grafen von Diessen', version 3.2 updated 30 March ...
Full citation
Cawley, Charles, 'Chapter 3D: Grafen von Diessen', version 3.2 updated 30 March 2015, in Medieval Lands: A prosopography of medieval European noble and royal families. http://fmg.ac/Projects/MedLands/BAVARIAN%20NOBILITY.htm#_Toc413507698 viewed 23 January 2016.