Engelbert I of Nassau was a son of Count John I of Nassau-Siegen and Countess Margaret of the Mark, daughter of Count Adolph II of the Marck.
- Occupation
- Q2197443, Count of Vianden, Count of Diez
- Position held
- provost, Marschal of Westphalia
- Born
- 1370
- Died
- May 3, 1442