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Haakon IV

(Encyclopedia)Haakon IV (Haakon Haakonsson), 1204–63, king of Norway (1217–63), illegitimate son of Haakon III and grandson of Sverre. Secretly reared by the Birkebeiner faction (see Sverre), he was chosen king...

Constantine IV, Byzantine emperor

(Encyclopedia)Constantine IV, c.652–685, Byzantine emperor (668–85), son and successor of Constans II. He defended Constantinople against the annual naval attacks of the Muslims, who finally withdrew in 678; Gr...

Muhammad IV, Ottoman sultan

(Encyclopedia)Muhammad IV or Mehmet IV, 1641–92, Ottoman sultan (1648–87). He was proclaimed sultan of the Ottoman Empire (Turkey) by the corps of Janissaries after the deposition and murder of his father, Sult...

Leo IV, Saint, pope

(Encyclopedia)Leo IV, Saint, d. 855, pope (847–55), a Roman; successor of Sergius II. He had seen the Saracen attack on Rome (846), and to prevent its recurrence he fortified the city and its suburbs. He built a ...

Leo IV, Byzantine emperor

(Encyclopedia)Leo IV (Leo the Khazar), d. 780, Byzantine emperor (775–80), son and successor of Constantine V. He owed his nickname to his mother, a Khazar princess. Leo tempered the iconoclastic excesses of his ...

Mortimer, Edmund de, 5th earl of March and 3d earl of Ulster

(Encyclopedia)Mortimer, Edmund de, 5th earl of March and 3d earl of Ulster, 1391–1425, English nobleman, son of Roger de Mortimer, 4th earl of March. He succeeded (1398) his father not only as earl of March and U...

York, Edmund of Langley, duke of

(Encyclopedia)York, Edmund of Langley, duke of, 1341–1402, fifth son of Edward III of England. He was made (1362) earl of Cambridge, served on expeditions to Spain and France, and married (1372) Isabel, daughter ...

George of Podebrad

(Encyclopedia)George of Podebrad pôdˈyĕbrät [key], 1420–71, king of Bohemia (1458–71). A Bohemian nobleman, he became leader of the Utraquists, or the moderate Hussites, in the wars between Hussites and Cat...

Belt, Great, and Little Belt

(Encyclopedia)Belt, Great, and Little Belt, straits: see Store Bælt and Lille Bælt, straits, Denmark. ...

Acton, Sir John Francis Edward

(Encyclopedia)Acton, Sir John Francis Edward, 1736?–1811, Neapolitan statesman of British origin, b. Besançon, France. Called upon by Queen Marie Caroline and King Ferdinand IV of Naples (later Ferdinand I of th...