She is married to Perthold von Plettenberg.
They got married in the year 1471.
Child(ren):
Geschichte der Kölnischen, Jülichschen und Bergischen Geschlechter in Stammtafeln, Wappen, Siegeln und Urkunden
by Anton Fahne
Publication date 1853
p. 101
https://archive.org/details/bub_gb_4NVDAAAAcAAJ/page/n115/mode/1up
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Irmgard von Nesselrode | |||||||||||||||||||||||||||||||||||
1471 | |||||||||||||||||||||||||||||||||||
Perthold von Plettenberg |