Charles Cawley, Fondation for Medieval Genealogy, Swabia Chap. 3 Dukes of Swabia...

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Charles Cawley, Fondation for Medieval Genealogy, Swabia Chap. 3 Dukes of Swabia (Konradiner) http://fmg.ac/Projects/MedLands/SWABIA.htm#Mathildedied1031 accessed Nov 2019

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