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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...

Raymond Berengar IV

(Encyclopedia)Raymond Berengar IV bĕrˈəngär [key], d. 1162, count of Barcelona (1131–62). He married Petronilla, daughter and heir of King Ramiro II of Aragón, after whose abdication (1137) Raymond also rule...

Gustavus IV

(Encyclopedia)Gustavus IV, 1778–1837, king of Sweden (1792–1809). On the assassination of his father, Gustavus III, he succeeded under the regency of his uncle, later King Charles XIII, a liberal. Attaining his...

Eugene IV

(Encyclopedia)Eugene IV, 1383–1447, pope (1431–47), a Venetian named Gabriele Condulmer; successor of Martin V. He was of exemplary character and ascetic habits. Gregory XII, his uncle, made him cardinal (1408)...

Christian IV

(Encyclopedia)Christian IV, 1577–1648, king of Denmark and Norway (1588–1648), son and successor of Frederick II. After assuming (1596) personal rule from a regency, he concentrated on building the navy, indust...

Clement IV, pope

(Encyclopedia)Clement IV, d. 1268, pope (1265–68), a Frenchman named Guy le gros Foulques; successor of Urban IV. He was a lay adviser of King Louis IX of France, but after his wife's death he entered the church....

Isaac II

(Encyclopedia)Isaac II (Isaac Angelus) ănˈjələs [key], d. 1204, Byzantine emperor (1185–95, 1203–4). The great-grandson of Alexius I, he was proclaimed emperor by the mob that had killed the unpopular Andro...

Adrian IV, pope

(Encyclopedia)Adrian IV, d. 1159, pope (1154–59), an Englishman (the only English pope), b. Nicholas Breakspear at Langley, near St. Albans. He was successor of Anastasius IV. At an early age he went to France. T...

Ivan IV

(Encyclopedia)Ivan IV or Ivan the Terrible, 1530–84, grand duke of Moscow (1533–84), the first Russian ruler to assume formally the title of czar. In his later years, Ivan's character, always stern, grew tyra...

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...