He later took over the lucrative provostship of the cathedral in Münster, in place of his older brother Engelbert, who stepped down to the secular state.

It is also assumed that he subsequently resigned from his position in Münster out of a predominant inclination for worldly matters, in order to be able to take part in all the undertakings of his quarrelsome brothers without any interference.

[6][7] Likewise, they promised each other, out of conviction of mutual advantages, not to inflict any violent advances on each other, and to allow the preferences of one and the other to apply, which had been established by older decrees.

Adolf hereby tacitly renounced his right to the part of Nassau-Hadamar and the districts of Herborn, Haiger and Löhnberg, which he could have claimed in advance from the marriage contract with the heiress of the County of Diez.

[8][note 5] When the actual transfer took place and in which year the brothers came into possession of the County of Vianden cannot be stated with certainty and reliability.

It probably happened in 1420 or 1421, because it was in the latter year that John II with the Helmet was first named Count of Vianden in the Palatinate feudal charter of 27 February.

[9] John the Younger obtained Greifenstein Castle [de] with the toll at Lahnstein from Roman King Sigismund on 4 April 1418.

[16] The Duke also appointed John the Younger as Oberst and Amtmann in the County of Mark[1][4] on 21 September 1424, for a period of eight years.

Yet, his association with Duke Adolf I of Cleves seems to have been short-lived, as John already took sides against his friend in the feud with the Electorate of Cologne.

[4] In a treaty of 1429 or 1439, the Nassau brothers jointly ceded their rights to the heerlijkheden of Ravenstein, Herpen and Uden to the Counts of Virneburg for a sum of 21,000 gold guilders.

[16] John's last fighting activity may have been the old family feud with the Landgraviate of Hesse, against which he and several of his relatives united with the Electorate of Mainz.

[17][note 12] He was succeeded by his brothers John II and Engelbert I, who jointly ruled their territories again, which continued until their deaths.

The accompanying text reads:[19]"Ich, der Graf von Hennegau und Holland,stehe hier vor dem Hintern dieser Sauund drücke hier mein Siegel an,weil ich es verpfändet und nicht eingelöst habevon dem Junggrafen Johann von Nassau.In Briefen ist es doch nicht mehr zu Danke,so wenig wie mein Eidschwur und meine Ehre.Ein Thor, der mir noch ferner dient.