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Romanus IV

(Encyclopedia)Romanus IV (Romanus Diogenes) dīŏjˈənēz [key], d. 1072, Byzantine emperor (1068–71). A Cappadocian general, he succeeded Constantine X by marrying his widow, Eudocia Macrembolitissa. After some...

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...

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...

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...

Thutmose IV

(Encyclopedia)Thutmose IV thŏthˈmēz, tōtˈmĕs [key], reigned c.1406–1398 b.c., king of ancient Egypt, of the XVIII dynasty, son and successor of Amenhotep II. He invaded Asia and Nubia, and formed alliances ...

Thibaut IV

(Encyclopedia)Thibaut IV tēbōˈ [key], 1201–53, French trouvère, count of Champagne. He became Thibaut I, king of Navarre, in 1234, succeeding his uncle Sancho VII. He was defeated while leading a Crusade (123...

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...

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...

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...

Ptolemy IV

(Encyclopedia)Ptolemy IV (Ptolemy Philopator) fĭlŏpˈətər [key], king of ancient Egypt (221–205 b.c.), of the Macedonian dynasty, son of Ptolemy III and Berenice of Cyrene. He had his mother, his brother, his...