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Trent, Council of

(Encyclopedia)Trent, Council of, 1545–47, 1551–52, 1562–63, 19th ecumenical council of the Roman Catholic Church, convoked to meet the crisis of the Protestant Reformation. Earlier efforts at reforming the ch...

Ten, Council of

(Encyclopedia)Ten, Council of, in the republic of Venice, a special tribunal created (1310) to avert plots and crimes against the state. It was a direct result of the unsuccessful Tiepolo conspiracy against the Ven...

Basel, Council of

(Encyclopedia)Basel, Council of, 1431–49, first part of the 17th ecumenical council in the Roman Catholic Church. It is generally considered to have been ecumenical until it fell into heresy in 1437; after that i...

Constantine VI, Byzantine emperor

(Encyclopedia)Constantine VI, b. c.770, Byzantine emperor (780–97), son and successor of Leo IV. His mother, Irene, was regent until 790, when she was deposed by a military revolt. Constantine recalled her in 792...

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...

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...

Theodore I , Byzantine emperor of Nicaea

(Encyclopedia)Theodore I (Theodore Lascaris), d. 1222, Byzantine emperor of Nicaea (1204–22), son-in-law of the Byzantine emperor Alexius III. He escaped from Constantinople after it was captured (1204) by the La...

Michael VIII, Byzantine emperor

(Encyclopedia)Michael VIII (Michael Palaeologus), c.1225–1282, Byzantine emperor (1261–82), first of the Palaeologus dynasty. Following the murder of the regent for Emperor John IV of Nicaea, he was appointed (...

Constantinople, Third Council of

(Encyclopedia)Constantinople, Third Council of, 680, regarded by Roman Catholic and Orthodox Eastern churches as the sixth ecumenical council. It was convoked by Byzantine Emperor Constantine IV to deal with Monoth...

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