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Conradin

(Encyclopedia)Conradin kŏnˈrədĭn [key], 1252–68, duke of Swabia, titular king of Jerusalem and Sicily, the last legitimate Hohenstaufen, son of Holy Roman Emperor Conrad IV. While Conradin was still a child i...

Bürgi, Joost

(Encyclopedia)Bürgi, Joost or Jost, 1552–1632, Swiss mathematician and instrument maker. As the official clockmaker (1579–92) to Duke Wilhelm IV of Hesse-Kassell, he developed the first clock with a minute han...

Jolliet, Louis

(Encyclopedia)Jolliet or Joliet, Louis both: jōˈlēĕtˌ, jōˌlēĕtˈ, Fr. lwē zhôlyāˈ [key], 1645–1700, French explorer, joint discoverer with Jacques Marquette of the upper Mississippi River, b. Quebec ...

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...

Lumière, Louis Jean

(Encyclopedia)Lumière, Louis Jean ōgüstˈ [key], 1862–1954, French inventors, brothers. They invented the Cinématographe, which was patented and demonstrated in 1895. This mechanism was the first to photograp...

Cavaignac, Louis Eugène

(Encyclopedia)Cavaignac, Louis Eugène lwē özhĕnˈ kävānyäkˈ [key], 1802–57, French general. He participated in the French conquest of Algeria and was promoted to general in 1844. After the outbreak of the...

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...

Frederick William IV

(Encyclopedia)Frederick William IV, 1795–1861, king of Prussia (1840–61), son and successor of Frederick William III. A romanticist and a mystic, he conceived vague schemes of reform based on a revival of the m...

Rienzi, Cola di

(Encyclopedia)Rienzi or Rienzo, Cola di kôˈlä dē rēĕnˈtsē, rēĕnˈtsō [key], 1313?–1354, Roman popular leader. In 1343 on a mission to Pope Clement VI at Avignon, he won the papal confidence. While ther...

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. ...