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Conrad IV, ruler of the Holy Roman Empire

(Encyclopedia)Conrad IV, 1228–54, German king (1237–54), king of Sicily and of Jerusalem (1250–54), son of Holy Roman Emperor Frederick II. He was elected (1237) king of the Romans at his father's instigation...

investiture

(Encyclopedia)investiture, in feudalism, ceremony by which an overlord transferred a fief to a vassal or by which, in ecclesiastical law, an elected cleric received the pastoral ring and staff (the symbols of spiri...

La Noue, François de

(Encyclopedia)La Noue, François de fräNswäˈ də lä no͞o [key], 1531–91, French Protestant general in the Wars of Religion (see Religion, Wars of). He fought at Jarnac (1569) and Moncontour (1569). In 1570 h...

John II, Spanish king of Castile and León

(Encyclopedia)John II, 1405–54, Spanish king of Castile and León (1406–54), son and successor of Henry III. He was little interested in government, which he entrusted to his favorite Alvaro de Luna. Literature...

Stafford, Edward, 3d duke of Buckingham

(Encyclopedia)Stafford, Edward, 3d duke of Buckingham, 1478–1521, English nobleman; son of Henry Stafford, 2d duke of Buckingham. The attainder (1483) of his father was reversed on the accession (1485) of Henry V...

York, Richard, duke of

(Encyclopedia)York, Richard, duke of, 1411–60, English nobleman, claimant to the throne. He was descended from Edward III through his father, Richard, earl of Cambridge, grandson of that king, and also through hi...

Douglas, Archibald, 4th earl of Douglas

(Encyclopedia)Douglas, Archibald, 4th earl of Douglas, 1369–1424, Scottish nobleman, called Tyneman [loser]; 2d son of Archibald Douglas, 3d earl of Douglas. In 1390 he married Margaret Stuart, daughter of Robert...

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 ...