Tags: Noble.
Otto I of Nassau (c. 1247–1290) Count of Nassau was the younger son of Count Henry II of Nassau and Matilda of Guelders.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.