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Helmholtz, Hermann Ludwig Ferdinand von

(Encyclopedia)Helmholtz, Hermann Ludwig Ferdinand von hĕrˈmän lo͞otˈvĭkh fĕrˈdēnänt fən hĕlmˈhôlts [key], 1821–94, German scientist. Although known especially as a physicist and biologist, he was al...

Charles V, duke of Lorraine

(Encyclopedia)Charles V (Charles Leopold), 1643–90, duke of Lorraine; nephew of Duke Charles IV. Deprived of the rights of succession to the duchy, he was forced to leave France and entered the service of the Hol...

Innocent I, Saint

(Encyclopedia)Innocent I, Saint, d. 417, pope (401–17), an Italian; successor of St. Anastasius I. A powerful champion of papal supremacy in the entire Church, he upheld St. John Chrysostom and condemned Pelagius...

Lombard League

(Encyclopedia)Lombard League, an alliance formed in 1167 among the communes of Lombardy to resist Holy Roman Emperor Frederick I when he attempted to assert his imperial authority in Lombardy. Previously the commun...

Confederation of the Rhine

(Encyclopedia)Confederation of the Rhine, league of German states formed by Emperor Napoleon I in 1806 after his defeat of the Austrians at Austerlitz. Among its members were the newly created kingdoms of Bavaria a...

West Roman Empire

(Encyclopedia)West Roman Empire: see Roman Empire under Rome. ...

John VIII, Byzantine emperor

(Encyclopedia)John VIII (John Palaeologus), 1390–1448, Byzantine emperor (1425–48), son and successor of Manuel II. When he acceded, the Byzantine Empire had been reduced by the Turks to the city of Constantino...

Worms, Concordat of

(Encyclopedia)Worms, Concordat of, 1122, agreement reached by Pope Calixtus II and Holy Roman Emperor Henry V to put an end to the struggle over investiture. By its terms the emperor guaranteed free election of bis...

Eutropius, Roman historian

(Encyclopedia)Eutropius yo͞otrōˈpēəs [key], fl. 4th cent. a.d., Roman historian, a protégé of the emperors Julian and Valens. His Breviarium ab urbe condita (10 books) is a summary of Roman history. ...

Michael II, Byzantine emperor

(Encyclopedia)Michael II (Michael the Stammerer), d. 829, Byzantine emperor (820–29). A native of Phrygia, he fought with Emperor Leo V, whom he had helped gain the throne. Leo had him arrested for heading a cons...