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John VI, king of Portugal

(Encyclopedia)John VI, 1769–1826, king of Portugal (1816–26), son of Maria I and Peter III. When his mother became insane, John assumed the reins of government (1792), although he did not formally become regent...

Peter II, king of Portugal

(Encyclopedia)Peter II, 1648–1706, king of Portugal (1683–1706), younger son of John IV; brother and successor of Alfonso VI. In 1667, he seized power from his incompetent brother and ruled the country as princ...

Peter III, king of Portugal

(Encyclopedia)Peter III, 1717–86, king of Portugal (1777–86), younger brother of Joseph. He married his niece Maria I and was joint ruler with her, though she generally was the dominant figure. ...

Peter IV, king of Portugal

(Encyclopedia)Peter IV, king of Portugal: see Pedro I, emperor of Brazil. ...

Peter V, king of Portugal

(Encyclopedia)Peter V, 1837–61, king of Portugal (1853–61), eldest son and successor of Maria II. Ascending the throne on the death of his mother, he ruled under the regency of his father, Ferdinand II, until 1...

Manuel I, Byzantine emperor

(Encyclopedia)Manuel I (Manuel Comnenus) kŏmnēˈnəs [key], c.1120–1180, Byzantine emperor (1143–80), son and successor of John II. He began his reign with a war against the Seljuk Turks, the subjugation of R...

Demetrius I, king of Macedon

(Encyclopedia)Demetrius I (Demetrius Poliorcetes) dĭmēˈtrēəs pŏlˌēôrsēˈtēz [key], c.337–283 b.c., king of Macedon. The son of Antigonus I, he proved himself a very able commander in his father's wars,...

David I, king of Scotland

(Encyclopedia)David I, 1084–1153, king of Scotland (1124–53), youngest son of Malcolm III and St. Margaret of Scotland. During the reign of his brother Alexander I, whom he succeeded, David was earl of Cumbria,...

Alexander I, king of Scotland

(Encyclopedia)Alexander I, 1078?–1124, king of Scotland (1107–24), son of Malcolm III and St. Margaret of Scotland. He succeeded his brother Edgar, who had divided the kingdom so that Alexander ruled only N of ...

Constantine I, king of Greece

(Encyclopedia)Constantine I, 1868–1923, king of the Hellenes, eldest son of George I, whom he succeeded in 1913. Married to Sophia, sister of the German emperor William II, he opposed the pro-Allied policy of the...