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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...

Gregory II, Saint

(Encyclopedia)Gregory II, Saint, d. 731, pope (715–31), a Roman; successor of Constantine. When Byzantine Emperor Leo III tried to impose iconoclasm in Italy by an imperial edict, Gregory answered that the empero...

Innocent IV

(Encyclopedia)Innocent IV, d. 1254, pope (1243–54), a Genoese named Sinibaldo Fieschi, a distinguished jurist who studied and later taught law at the Univ. of Bologna; successor of Celestine IV. He was of a noble...

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...

Peter IV, king of Aragón

(Encyclopedia)Peter IV (Peter the Ceremonious), 1319?–1387, king of Aragón and count of Barcelona (1336–87); son and successor of Alfonso IV. He supported Alfonso XI of Castile at the battle of Tarifa (1340), ...

Romanus II

(Encyclopedia)Romanus II, 939–63, Byzantine emperor (959–63), son and successor of Constantine VII. A profligate, he came under the domination of his second wife, Theophano. She, along with the eunuch Joseph Br...

Eustace IV

(Encyclopedia)Eustace IV, count of Boulogne: see under Eustace II. ...

Rama IV, king of Siam

(Encyclopedia)Rama IV: see Mongkut.

Charles IV, king of Spain

(Encyclopedia)Charles IV, 1748–1819, king of Spain (1788–1808), second son of Charles III, whom he succeeded in place of his imbecile older brother. Unlike his father, Charles IV was an ineffective ruler and in...

Ferdinand IV, king of Naples

(Encyclopedia)Ferdinand IV, king of Naples: see Ferdinand I, king of the Two Sicilies. ...