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.
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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).
Henry of Isenburg-Kempenich was the co-Lord of Isenburg-Kempenich in 1367, ruling jointly with his brothers Theodoric VI, John, and Henry.
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.
John of Isenburg-Kempenich was the co-Lord of Isenburg-Kempenich from 1367 until 1424, ruling jointly with his brothers Simon III, Theodoric VI, and Henry.
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After his death in 1367, John and his brothers became the co-rulers of Kempenich despite an agreement in 1345 whereby Kempenich was declared indivisible.
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John had one child: a daughter, Hedwig, who was married to Peter of Schöneck.
Simon III of Isenburg-Kempenich was the co-Lord of Isenburg-Kempenich from 1367 until 1420, ruling jointly with his brothers Theodoric VI, John, and Henry.
Theodoric VI of Isenburg-Kempenich was the co-Lord of Isenburg-Kempenich from 1367 until after 1378, ruling jointly with his brothers Simon III, John, and Henry.