Count Welf Isembart of Altdorf & Thurgau & Irmentruda Theidrada von Nagolzgau of Germany 
They had a son named Welf.
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Personal Details
Irmentruda Theidrada von Nagolzgau of Germany
Irmentruda Theidrada was born after 0740 in Nagolzgau, Alemanni Territory. She died after 0776.
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