The Church Fathers, Early Church Fathers, Christian Fathers, or Fathers of the Church were ancient and influential Christian theologians and writers. There is no definitive list. The era of these scholars who set the theological and scholarly foundations of Christianity largely ended by AD 700 (John of Damascus died in 749 AD, Byzantine Iconoclasm began in 726 AD).
In the past, the Church Fathers were regarded as authoritative and more restrictive definitions were used which sought to limit the list to authors treated as such. However, the definition has widened as scholars of patristics, the study of the Church Fathers, have expanded their scope.