Otto I, Count of Nassau

[5] Nassau Castle and dependencies (Dreiherrische),[10] the Ämter Miehlen and Schönau (Schönau Abbey near Strüth über Nastätten)[11] as well as the Vierherrengericht,[12] Laurenburg Castle, the Esterau (which was jointly owned with the counts of Diez) and the fiefs in Hesse remained jointly owned.

[5] Protecting and enforcing his rights in his country was not always easy for Otto, especially at a time when the power of the supreme patron in the empire had sunk deeply.

Otto's relationship with Siegfried II of Westerburg, the Archbishop of Cologne, also remains unclear.

[6] Otto made a covenant with various lords in Westphalia on 8 April 1277 to wage war against the archbishop.

[13] ʻOttho comes de Nassawen … cum uxore nostra Agnete nec non Henrico nostro primogenitoʼ confirmed the donation of ʻbonorum in Hasilbach et Aldindorphʼ to the church in Aldenburg (read: Altenberg Abbey) made by ʻmatrem nostram Methildim comitissam bone mem … cum sorore nostra Katherina ibidem locataʼ by charter dated 3 May 1289.