John II Komnenos or
Comnenus (,
Ioannes II Komnenos; September 13, 1087 – April 8, 1143) was
Byzantine Emperor from 1118 to 1143. Also known as "John the Beautiful" or "John the Good" (
Kaloïoannes), he was the eldest son of Emperor Alexios I Komnenos and
Irene Doukaina and the second emperor to rule during the
Komnenian restoration of the Byzantine Empire. John was a pious and dedicated monarch who was determined to undo the damage his empire had suffered following the
battle of Manzikert, half a century earlier.