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Murad IV

(Encyclopedia)Murad IV, 1612?–1640, Ottoman sultan (1623–40), nephew and successor of Mustafa I. He recovered (1638) Baghdad, which Shah Abbas I of Persia had seized. On his victory he sent an order to murder h...

Mustafa IV

(Encyclopedia)Mustafa IV, 1778–1808, Ottoman sultan (1807–8), son of Abd al-Hamid I. He was raised to the throne by the reactionary Janissaries who had deposed Mustafa's cousin, Selim III, because they opposed ...

Paul IV

(Encyclopedia)Paul IV, 1476–1559, pope (1555–59), a Neapolitan named Gian Pietro Carafa; successor of Marcellus II. First superior of the Theatines (see Cajetan, Saint), he was sternly ascetic. A leading reform...

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...

Pius IV

(Encyclopedia)Pius IV, 1499–1565, pope (1559–65), a Milanese named Giovanni Angelo de' Medici; successor of Paul IV. He was probably not related to the great Medici family. His career in Rome began in 1527, and...

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...

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...

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...

Urban IV

(Encyclopedia)Urban IV, d. 1264, pope (1261–64), a Frenchman (b. Troyes) named Jacques Pantaléon; successor of Alexander IV. In the pontifical service he was sent on missions into N Germany; then he was made bis...

Bela IV

(Encyclopedia)Bela IV bāˈlə, bēˈlə [key], 1206–70, king of Hungary (1235–70), son and successor of Andrew II. He tried to curtail the power of the magnates and set out to recover the crownlands his father...