Sub-periods: Early / "Dark Ages" (~500–1000) · High Middle Ages (~1000–1300) · Late Middle Ages (~1300–1500).
| c. 530 | Benedict's Rule — ora et labora; the blueprint for Western monasticism (Monte Cassino). |
| 590–604 | Gregory I "the Great" — the first medieval pope; governs Rome, sends missionaries. |
| 910 | Cluny founded — launches the great monastic reform movement. |
| 1054 | The Great Schism — East (Orthodox) & West (Catholic) split, over the filioque + the papacy. |
| 1077 | Canossa — Gregory VII vs. Henry IV (Investiture Controversy); pope over kings. |
| c. 1270 | Aquinas & scholasticism — faith seeking understanding; the medieval mind. |
| 1309–77 | Avignon papacy — popes in France ("Babylonian Captivity"); authority discredited. |
| 1378–1417 | Great Western Schism — two, then three rival popes. Catholics vs. Catholics. |
| 1384 / 1415 | Wycliffe (d.1384) & Hus (burned 1415) — the "morning stars" challenge the doctrine. |
| 1414–18 | Council of Constance — ends the Schism (one pope); burns Hus. |
Two engines of the era
Power from the top: the papacy climbs (Leo → Gregory I → Gregory VII). Preservation from the ground: the monks copy, farm, evangelize, heal.
The recurring rhythm
Zeal → wealth → corruption → reform → zeal again. Seen in monasticism (Cluny, Cistercians) — and it's the Reformation in miniature.
The thread →: by 1500 the church's authority was cracked (rival popes) and its doctrine was being challenged (Wycliffe, Hus). The wall was ready. All it needed was a spark — and a stubborn enough monk.