Background
His father was Diether VIII, a count of Katzenelnbogen from the younger line of the House of Katzenelnbogen, and ruled mainly in Upper Katzenelnbogen.
His father was Diether VIII, a count of Katzenelnbogen from the younger line of the House of Katzenelnbogen, and ruled mainly in Upper Katzenelnbogen.
He ruled the reunited County of Katzenelnbogen. Johann's mother was Elisabeth, a daughter of Adolph I of Nassau-Wiesbaden (1307–1370). He had two sons: Philipp II (1427–1453) and Eberhard (d 1456), however, they both predeceased him.
Philipp I was the last male member of the House of Katzenelnbogen.