Suggested search terms:
| LCSH | Keyword |
| ORTHODOX Christianity | orthodoxy |
| CHRISTIAN heresies--History--Middle Ages, ca. 600-1500 | Roman Catholic church |
| CHRISTIAN heretics | theological movements |
| GNOSTICISM | "early church" growth |
| MARCIONISM | |
| MANICHAEISM | |
| MONTANISM | |
| MONARCHIANISM | |
| DONATISTS | |
| IGNATIUS, Saint, Bp of Antioch | |
| POLYCARP, Saint, Bp of Smyrna | |
| JUSTIN, Martyr, Saint | |
| ARISTIDES, 2d cent | |
| APOLOGISTS (Christians) | |
| ATHENAGORAS, 2d cent | |
| TATIAN, ca 120-173 | |
| IRENAEUS, Saint, Bp of Lyons | |
| TERTULLIAN, ca 160-ca230 | |
| CYPRIAN, Saint, Bp of Carthage | |
| ORIGEN | |
| EUSEBIUS, Bp of Caesarea | |
| AMBROSE, Saint, Bp of Milan | |
| JOHN Chrysostom, Saint, d 407 | |
| THEODORE, Bp of Mopsuestia, ca 350-428 or 9 | |
| JEROME, Saint, d 419 or 20 | |
| AUGUSTINE, Saint, Bp of Hippo | |
| CHURCH history--Primitive & early church, ca. 30-600 | |
| CHURCH history--Middle Ages, 600-1500 | |
| THEOLOGY--History--Early church, ca. 30-600 | |
| THEOLOGY--History--Middle Ages, 600-1500 | |
| PERSECUTION of Christians--History--Early church, ca. 30-600 | |
| PERSECUTION--History--Middle Ages, 600-1500 | |
| MARTYRDOM--Christianity | |
| CHRISTIAN martyrs | |
| ROME--History--BC 30-AD 284 (Empire) | |
| ROMAN roads | |
| ANCIENT philosophy | |
| PHILOSOPHY and Christianity--Greek philosophy | |
| POLYTHEISM | |
| MONOTHEISM | |
| JEWISH messianic movements | |
| JEWISH ethics | |
| JEWISH philosophy--Early works to 1800 | |
| JESUS Christ--Historicity | |
| MONASTICISM & religious orders--History--Middle Ages, 600-1500 | |
| MONASTIC life | |
| CRUSADES--First, 1096-1099 | |
| CISTERCIAN monasteries | |
| CISTERCIAN convents | |
| FRIARS | |
| FRANCISCANS | |
| MONKS | |
| WALDENSES | |
| ALBIGENSES | |
| ALBIGENSIAN Crusade, 1209-1229 | |
| ORTHODOX (Orthodox Eastern Church) | |
| HOLY Spirit--Procession [used for filioque] | |
| NICENE Creed | |
| ICONOCLASM | |
| CELIBACY--Christianity | |
| SCHOLASTICISM (Theology) | |
| REALISM | |
| ABELARD, Peter, 1079-1142 | |
| THOMAS, Aquinas, Saint, 1225c-1274 | |
| NOMINALISM | |
| WILLIAM of Ockham, ca 1285-ca1349 | |
| BACON, Roger, 1214c-1294 | |
| FATHERS of the church | |
| CONVENTS | |
| LITURGIES, Early Christian | |
| CHRISTIANITY & other religions--Islam |