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Vernadsky, George

(Encyclopedia)Vernadsky, George vĕrnätˈskē [key], 1887–1973, American historian, b. Russia. He emigrated to the United States in 1927 and was research associate in history (1927–46) and professor of Russian...

Lyons, Second Council of

(Encyclopedia)Lyons, Second Council of, 1274, 14th ecumenical council of the Roman Catholic Church. It was summoned by Pope Gregory X to discuss problems in the Holy Land, to remove the schism of East and West, and...

John III, king of Poland

(Encyclopedia)John III (John Sobieski) sôbyĕˈskē [key], 1624–96, king of Poland (1674–96), champion of Christian Europe against the Ottomans. Born to an ancient noble family, he was appointed (1668) command...

Ivan II

(Encyclopedia)Ivan II or Ivan Asen ēˈvän äˈsən [key], d. 1241, czar of Bulgaria (1218–41). On the death (1207) of his father, Kaloyan, founder of the second Bulgarian empire, the throne was usurped by Ivan'...

Sicilian Vespers

(Encyclopedia)Sicilian Vespers, in Italian history, name given the rebellion staged by the Sicilians against the Angevin French domination of Sicily; the rebellion broke out at Palermo at the start of Vespers on Ea...

Monnier, Henri

(Encyclopedia)Monnier, Henri äNrēˈ mônyāˈ [key], 1799–1877, French lithographer and writer. His work became popular (c.1825) when he illustrated La Fontaine's Fables with pen drawings. He wrote and illustra...

Leopold II, Holy Roman emperor, king of Bohemia and Hungary

(Encyclopedia)Leopold II, 1747–92, Holy Roman emperor (1790–92), king of Bohemia and Hungary (1790–92), as Leopold I grand duke of Tuscany (1765–90), third son of Maria Theresa. Succeeding his father, Holy ...

induction, in electricity and magnetism

(Encyclopedia)induction, in electricity and magnetism, common name for three distinct phenomena. Electromagnetic induction is the production of an electromotive force (emf) in a conductor as a result of a changing ...

Romanus IV

(Encyclopedia)Romanus IV (Romanus Diogenes) dīŏjˈənēz [key], d. 1072, Byzantine emperor (1068–71). A Cappadocian general, he succeeded Constantine X by marrying his widow, Eudocia Macrembolitissa. After some...

Kostroma

(Encyclopedia)Kostroma kəstrəmäˈ [key], city (1989 pop. 278,000), capital of Kostroma region, E European Russia, on the Volga at the mouth of the Kostroma River. It is a major linen-milling and textile machiner...