Otto I of Nassau Count of Nassau (1251-1289/90) (1247–1300) Parents Matilda of Guelders Henry II of Nassau Children Mechtild of Nassau Otto of Nassau Gertrud of Nassau John of Nassau-Dillenburg Henry I of Nassau-Siegen Emicho I of Nassau-Hadamar Siblings Henry of Nassau Jutta of Nassau Catherine of Nassau John I of Nassau, Bishop-Elect of Utrecht Rupert of Nassau Elisabeth of Nassau Walram II of Nassau Gerhard of Nassau Partners Agnes of Leiningen