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From the Foundation for Medieval Genealogy Medlands page for Nassau (covering his birth family):
http://fmg.ac/Projects/MedLands/NASSAU.htm#JohannIdied1416A
OTTO [II] von Nassau ([1305]-killed in battle [Dec 1350/Jan 1351]).
m (contract 23 Dec 1331) ADELHEID von Vianden, daughter of PHILIPP [II] Graf von Vianden & his wife Adelheid von Arnsberg (-30 Sep 1376).
Otto [II] & his wife had four children:
i) ADELHEID .
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ii) JOHANN [I] von Nassau (-Herborn 4 Sep 1416, bur Kloster Keppel).
m (contract 14 Aug 1343, 20 Nov 1357) MARGARETA von der Mark, daughter of ADOLF [II] Graf von der Mark & his wife Margareta von Kleve (-1409). "Alf graue van der Mark unde Margret sin…husfrouwe" agreed with "Otten grauen van Nassauwe und frouwen Aleyde" that "eine dochter van unseren dochteren" would marry "einem sone van soenen…Otten grauen van Nassauwe und frouwen Alheyd vorgenant" by charter dated 14 Aug 1343[108]. "Johan greue tho Nassouwe der jungste" acknowledge receipt from "unse…suager Engelbracht greue van der Marke" of the dowry for his marriage "mit syuer suster Margareten van der Marke unser…huysvrouwen" by charter dated 23 Sep 1369[109].
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iii) HEINRICH "der Haudegen" (-Kassel 5 Sep 1402).
iv) OTTO (-1384).
References:
From Darryl Lundy's Peerage page on Johann I von Nassau-Dillenburg (covering his marriage family):
Johann I von Nassau [1]
Johann I von Nassau died in 1416, killed in action.[1]
He was the son of Otto II Graf von Nassau-Dillenburg.[1]
Children of Johann I von Nassau Engelbert I von Nassau+[1] d. 1442 Adolf von Nassau [1] d. 1420 Johann II von Nassau [1] d. 1443 Johann III von Nassau [1] d. 1429
Citations
Count of Nassau-Dillenburg In a statute of the monastery where he is buried, dating from 1392, he is mentioned as its founder and patron. His mother Adelheid, Countess of Vianden, had during the last fifteen years of her widowhood been its 'magistra'. She was buried there. The oldest document in which the monastery (for nuns of noble birth) is mentioned dates from 1239. In that act count Henry II 'the Rich' of Nassau promises, at the request of one of his vassals, the revenues of the church of Netphen.
1339 |
1339
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Nassau, Rhineland-Palatinate, Germany
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1362 |
1362
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Of,Dillenburg,Hessen-Nassau,Prussia
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1364 |
1364
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Dillenburg, Hesse, Duitsland (Germany)
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1370 |
1370
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Dillenburg Castle, Dillenburg, Grafschaft Nassau-Dillenburg (Present Lahn-Dill-Kreis), (Present Hessen), Heiliges Römisches Reich (Present Germany)
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1376 |
1376
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Dillenburg, Hesse, Duitsland (Germany)
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1382 |
1382
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Dillenburg, Hesse, Duitsland (Germany)
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1416 |
September 4, 1416
Age 77
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Herborn, Grafschaft Nassau-Dillenburg (Present Lahn-Dill-Kreis), (Present Hesse), Heiliges Römisches Reich (Present Germany)
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Stift Keppel, Kreis Siegen-Wittgenstein, Hilchenbach-Allenbach, Nordrhein-Westfalen, Deutschland (Germany)
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