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]).

• "Aleydis uxor…Henrici comitis de Nassouwia" renounced the inheritance from "felicis recordationis…Walrami domini quondam de Blanckenberch fratris nostri" in favour of "nostrum consanguineum…Theodericum dominum de Heymsbergh et de Blamckenberch militem filium quondam domini Godefridi fratris nostri", with the consent of "domini Henrici nostri mariti comitis prelibati nec non Ottonis militis primogeniti ac Henrici prepositi Spirensis nostrorum filiorum", by charter dated 8 Feb 1333[102].
• Graf von Nassau in Siegen und Dillenburg. "Otto greue van Nassowe ind Aleyd van Vianden syn…husfrowe" sold half of the town of Gensberg to Walram Archbishop of Köln by charter dated 13 Feb 1345[103].

m (contract 23 Dec 1331) ADELHEID von Vianden, daughter of PHILIPP [II] Graf von Vianden & his wife Adelheid von Arnsberg (-30 Sep 1376).

• "Otto greue van Nassowe ind Aleyd van Vianden syn…husfrowe" sold half of the town of Gensberg to Walram Archbishop of Köln by charter dated 13 Feb 1345[104]. "Wilhelm…marcgreue zu Guilge" reached agreement with "unser niechten vrauwe Aleyde greuinnen van Nassauwe, yren kynden ind yren eruen, heren Frederiche heirren zu Cronenberch ind heren Goedarde heirren zu Wyltz […unserm niechten]" to divide the half share of "Wilhelme greuen zu Namen" in the inheritance of the late "unsme neiuen greue Lodewiche van Vyanden" by charter dated 23 May 1356[105].
• This document was incorrectly interpreted by Walther Möller, who assumed that Friedrich Herr zu Kronenberg was one of the "kynden ind…eruen" of countess Adelheid, and therefore that she had married firstly his father Johann von Dollendorf Herr zu Kronenberg[106]. The document should more correctly be read as referring to countess Adelheid and her unnamed children. Adelheid is called "niechte" of Wilhelm Markgraf von Jülich in the document, which indicates her maternal ancestry, Petronella von Jülich being her maternal grandmother[107].

Otto [II] & his wife had four children:

i) ADELHEID .

• Nun at Keppel 1376, abbess 1378/1381.

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ii) JOHANN [I] von Nassau (-Herborn 4 Sep 1416, bur Kloster Keppel).

• Graf von Nassau-Dillenburg in Siegen und Dillenburg.

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).

• Canon at Köln Cathedral 1356/1356. *Heinrich had one illegitimate child by an unknown mistress: Heinrich (d. 1440, m. Gutgen von Morsdorf)

iv) OTTO (-1384).

• Canon and provost of St Moritz at Mainz 1357.
• Canon at Köln and Mainz Cathedrals 1380.

References:

• [102] Kremer (1769), Band I, Urkunden Heinsberg, XIX, p. 27.
• [103] Lacomblet, T. J. (ed.) (1853) Urkundenbuch für die Geschichte des Niederrheins, Band III (Düsseldorf) ("Niederrheins Urkundenbuch"), 419, p. 330.
• [104] Niederrheins Urkundenbuch, Band III, 419, p. 330.
• [105] Niederrheins Urkundenbuch, Band III, 554, p. 465.
• [106] Möller, W. ´Ein Beitrag zur Genealogie der Grafen von Vianden und zur Vererbung con der Neuerburg´, Annuaire de la Société héraldique luxembourgeoise (1950). (information provided by Bert M. Kamp in a private email to the author dated 16 May 2010).
• [107] Berg, A. ´Wer war der Gemahl der Erbtochter Lucie von der Neuerburg´, Genealogie (1980), pp. 180-81, and Kamp, B. M. ´De moeder van Adelheid van Vianden´, De Nederlandsche Leeuw (1998), cols. 266-77 (information supplied by Bert M. Kamp, in a private email to the author dated 16 May 2010).
• [108] Niederrheins Urkundenbuch, Band III, 396, p. 314.
• [109] Niederrheins Urkundenbuch, Band III, 707, p. 605.

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From Darryl Lundy's Peerage page on Johann I von Nassau-Dillenburg (covering his marriage family):

Johann I von Nassau [1]

• M, #115000,
• d. 1416
• Last Edited=30 Aug 2008

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

• 1. [S16] Jirí Louda and Michael MacLagan, Lines of Succession: Heraldry of the Royal Families of Europe, 2nd edition (London, U.K.: Little, Brown and Company, 1999), table 33. Hereinafter cited as Lines of Succession.