| A | B |
| Constantine | Christian Roman Emperor |
| Edict of Milan | 313 - Christianity no longer a forbidden religion |
| Anthony of Egypt | Hermit, who later founded a moastic community |
| St. Pachomius | Wrote a rule of life for nuns and monks in Egypt |
| St. Basil | Wrote a rule for nuns and monks in the Near East |
| Heresy | A false teaching that rejects a truth that has been revealed by God |
| Arian heresy | Denied that Jesus was both human and divine |
| Synod | Meeting of bishops |
| Council of Nicaea | 325 - Ecumenical Council called to refute the Arian heresy. |
| Nicene Creed | From the Council of Nicaea - clearly expressed the Jesus is true God and true man. |
| Council of Constantinople | 381 - Finished the work of the Nicene Creed |
| Nestorian heresy | Jesus was two persons-Mary was the mother of the human Jesus, but not the mother of God. |
| Council of Ephesus | 431 - Refuted the Nestorian heresy |
| Ignatius | Bishop of Antioch - wrote letters to Christian communities |
| Ambrose | Bishop - defended the Church against heretics |
| Athanasius | Defended the Church against the Arian heresy |
| John Chrysostom | "Golden-mouth" - inspiring sermons |
| Jerome | Translated the Bible from the Hebrew and Greed into Latin |
| Vulgate | Jerome's translation of the Bible |
| Monica | Mother of St. Augustine |
| Augustine | Bishop of Hippo - outstanding Christian writer, teacher, and theologian |