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Nicaea, First Council of

(Encyclopedia)Nicaea, First Council of, 325, 1st ecumenical council, convened by Roman Emperor Constantine the Great to solve the problems raised by Arianism. It has been said that 318 persons attended, but a more ...

Nicaea, Second Council of

(Encyclopedia)Nicaea, Second Council of, 787, 7th ecumenical council, convened by Byzantine Empress Irene. Called to refute iconoclasm, the council declared that images ought to be venerated (but not worshiped) and...

Lyons, First Council of

(Encyclopedia)Lyons, First Council of lyôNˈ [key], 1245, 13th ecumenical council of the Roman Catholic Church, convened at Lyons, France, by Pope Innocent IV to deal with his struggle with Holy Roman Emperor Fred...

Constantinople, First Council of

(Encyclopedia)Constantinople, First Council of, 381, second ecumenical council. It was convened by Theodosius I, then emperor of the East and a recent convert, to confirm the victory over Arianism. The council drew...

Lateran Council, First

(Encyclopedia)Lateran Council, First, 1123, 9th ecumenical council of the Roman Catholic Church, summoned by Pope Calixtus II to signal the end of the investiture controversy by confirming the Concordat of Worms (1...

Vatican Council, First

(Encyclopedia)Vatican Council, First, 1869–70, the 20th ecumenical council of the Roman Catholic Church (see council, ecumenical), renowned chiefly for its enunciation of the doctrine of papal infallibility. Tw...

Nicaea

(Encyclopedia)Nicaea nīsēˈə [key], city of Bithnyia, N Asia Minor, built in the 4th cent. b.c. by Antigonus I as Antigonia and renamed Nicaea by Lysimachus for his wife. It flourished under the Romans. It was t...

Nicaea, empire of

(Encyclopedia)Nicaea, empire of, 1204–61. In 1204 the armies of the Fourth Crusade set up the Latin Empire of Constantinople, but the Crusaders' influence did not extend over the entire Byzantine Empire. Several ...

Arius

(Encyclopedia)Arius ərīˈəs, ârˈē– [key], c.256–336, Libyan theologian, founder of the Arian heresy. A parish priest in Alexandria, he advanced the doctrine famous as Arianism and was excommunicated local...