| Term | Definition |
|---|
| Nicaea 1 (325) | condemned arianism and declared the son "consubstantial" (homoousia) with the father |
| Constantinople 1 (381) | condemned Macedonians and declared the Holy Spirit consubstantial with the father and son |
| Ephesus (431) | condemned Nestorians and pelagians; declared divine maternity of the blessed mother |
| Chalcedon (451) | condemned monophysitism |
| Constantinople 2 (553) | condemned the 3 chapters: propositions of anathematizing |
| Constantinople 3 (680) | condemned monothelitism and censored honorius |
| Nicaea 2 (787) | condemned iconoclasm |
| Constantinople 4 | [869] ended the Greek Schism and deposed Photius |
| Lyons 1 | [1245] deposed Frederick II, planned a crusade |
| Lyons 2 | [1274] reunited the Church with the Greeks |
| Vienne | [1311-1312] abolished the Nights Templar; enacted reforms |
| Constance | [1414-1418] ended the Great Schism; condemned Jan Hus |
| Basel, Ferrara, Florence | [1431-1445] effected union of Greeks; enacted reforms |
| Lateran V | [1512-1517] invalidated decrees of the Pisan Council |
| Trent | [1545-1563] condemned Protestantism; enacted reforms; addressed sola scriptura and sola fides |
| Vatican 1 | [1869-1870] condemned errors, defined papal infallibility |
| Vatican 2 | [1962-1965] addressed modernity |
| Lateran I | [1123] issued decrees on celibacy and lay investiture |
| Lateran II | [1139] ended the papal schism and ended reforms |
| Lateran III | [1179] condemned albigenses and waldenses and regulated papal elections |
| Lateran IV | [1215] planned a crusade; enacted decrees on annual communion' repeated condemnation of albigenses; enacted reforms |
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