Simon III of Isenburg Kempenich

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.

Simon III was the eldest son Simon II. After his death in 1367, Simon 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 and Theodoric soon after 1378, leaving Simon and John as the lords. In 1420 Simon died without any direct descendants, leaving John as the sole ruler.