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Gerlach was the son of Henry (Heinrich) I of Isenburg-Grenzau and his wife, Irmingard of Büdingen, Countess of Cleeberg (now part of Langgöns).
Isenburg-Arnfels was created upon the partition in 1286 of the lands of Count Henry II between his sons, the youngest Gerlach receiving his territories in and around Bad Hönningen.
Johann V. von Isenburg auch Johann V. von Isenburg-Grenzau (* ca. 1507 – † 18 February 1556 in Montabaur) war von 1547 bis 1556 Erzbischof und Kurfürst von Trier.