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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....

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...

Berenice, c.273–21 b.c., queen of ancient Cyrene and Egypt

(Encyclopedia)Berenice, c.273–21 b.c., queen of ancient Cyrene and Egypt. She was the daughter and successor of King Magas of Cyrene. In 247 b.c. she married Ptolemy III, thereby effectively annexing Cyrene to Eg...

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...

Leo IV, Byzantine emperor

(Encyclopedia)Leo IV (Leo the Khazar), d. 780, Byzantine emperor (775–80), son and successor of Constantine V. He owed his nickname to his mother, a Khazar princess. Leo tempered the iconoclastic excesses of his ...

Martin IV, d. 1285, pope

(Encyclopedia)Martin IV, d. 1285, pope (1281–85), a Frenchman named Simon de Brie; successor of Nicholas III. He was chancellor under Louis IX of France and was created cardinal by Urban IV. He was thus a support...