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Waldemar IV

(Encyclopedia)Waldemar IV (Valdemar Atterdag), c.1320–1375, king of Denmark (1340–75). He became king of a land completely dismembered by foreign rulers, but his ambition, unscrupulousness, and military ability...

Vlad IV

(Encyclopedia)Vlad IV, 1431?–1476, prince of Walachia (1448, 1456–62, 1476), known as Vlad the Impaler. He was the son of Prince Vlad Dracul (Vlad the Devil) and is therefore also called Dracula or son of the D...

Geoffrey IV

(Encyclopedia)Geoffrey IV, known as Geoffrey Plantagenet plătăjˈənət [key] [O.Fr.,=sprig of broom; he usually wore a sprig in his helmet], 1113–51, count of Anjou (1129–51); son of Fulk, count of Anjou and...

Edward IV

(Encyclopedia)Edward IV, 1442–83, king of England (1461–70, 1471–83), son of Richard, duke of York. He succeeded to the leadership of the Yorkist party (see Roses, Wars of the) after the death of his father i...

Abd ar-Rahman, Muslim governor of Spain

(Encyclopedia)Abd ar-Rahman äbˌdär-rämänˈ [key], d. 732, Muslim governor of Spain (721–32). Invading Aquitaine in 732, he won a victory over the Franks at Toulouse but was defeated in the battle of Tours by...

Sixtus IV

(Encyclopedia)Sixtus IV sĭkˈstəs [key], 1414–84, pope (1471–84), an Italian named Francesco della Rovere (b. near Savona); successor of Paul II. He was made general of his order, the Franciscans, in 1464 and...

Ladislaus IV

(Encyclopedia)Ladislaus IV, 1262–90, king of Hungary (1272–90), son and successor of Stephen V. Ladislaus became unpopular by favoring the Cumans, from whom he was descended through his mother. During his reign...

Malcolm IV

(Encyclopedia)Malcolm IV, 1141–65, king of Scotland (1153–65), grandson and successor of David I. On his accession the young king was at once faced with a rebellion of the western Gaels, supported by the Norse,...

Alexius IV

(Encyclopedia)Alexius IV (Alexius Angelus), d. 1204, Byzantine emperor (1203–4), son of Isaac II. When his father was deposed, Alexius fled to Italy and then went to Germany. Encouraged by his brother-in-law, Phi...

Casimir IV

(Encyclopedia)Casimir IV, 1427–92, king of Poland (1447–92). He became (1440) ruler of Lithuania and in 1447 succeeded his brother Ladislaus III as king of Poland. He united the two nations more closely by plac...