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. John was the third son of Simon II. 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. Already in 1367 the brothers built a tomb for their father and sent their mother to the Abbey of Laach. Henry died in 1367, Theodoric soon after 1378, and Simon in 1420 leaving John as the sole lord. John had one child: a daughter, Hedwig, who was married to Peter of Schöneck. After John's death in 1424, the line of Isenburg-Kempenich was extinct and was inherited by Peter