Otto I, Count of Nassau

Otto I, Count of Nassau
Spouse(s) Agnes of Leiningen
Noble family House of Nassau
Father Henry II of Nassau
Mother Matilda of Guelders
Born c.1247
Died 1290

Otto I of Nassau (c.12471290), Count of Nassau was the younger son of Count Henry II of Nassau and Matilda of Guelders.[1]

Otto I became the count of Dillenburg, Hadamar, Siegen, Herborn and Beilstein after many years of quarrel with his brother Count Walram II. In the division of 17 December 1255 he received possessions north to the Lahn. And thus began the geographical and political separation of the House of Nassau. He became the founder of the Ottonian line of the house. He stood against the local aristocracy, particularly the counts of Greifenstein and of Dernbach and was for many years banished, since he withheld lands of Teutonic Knights, which his uncle had left to him. Among his opponents were the archbishops of Cologne and Trier, who presented the territorial claims. He lost also the lordships in Emsland and Koblenz.

Family and children

He married Agnes of Leiningen, a daughter of Count Emich IV of Leiningen and had following children:[2]

  1. Henry, Count of Nassau in Siegen (d. 1343), Count in Nassau-Siegen, Ginsburg, Haiger and in Westerwald since 1303, in Dillenburg, Herborn and Beilstein in 1328–43.
  2. Emicho I, Count of Nassau-Hadamar (d. 7 June 1334) in Driedorf, Esterau and Hadamar.
  3. John (d. 1328), Count in Beilstein and Herborn since 1303, in Katzenelnbogen since 1320.
  4. Mechtild (d. 28 October 1319), married ca. 1289 to Gerhard von Schönecken.
  5. Gertrud (d. 19 September 1359), Abbess of Altenberg.

He also had an illegitimate son Henry, who was a monk in Arnstein and a priest in Nassau.

Otto I, Count of Nassau
Born: c.1247 Died: 1290
Preceded by
Henry II
Count of Nassau-Siegen
Succeeded by
Count of Nassau-Hadamar
Succeeded by
Emicho I
Count of Nassau-Dillenburg
Succeeded by


  1. De Nederlandsche leeuw: Maandblad van het Koninklijk Nederlandsch Genootschap voor Geslacht- en Wapenkunde, Volumes 1889-1894, pg 89-91 Google Books
  2. Cawley, Charles, House of Nassau, Medieval Lands database, Foundation for Medieval Genealogy,
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