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(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...

Wenceslaus IV, king of Bohemia

(Encyclopedia)Wenceslaus IV, king of Bohemia: see Wenceslaus, Holy Roman emperor. ...

Peter IV, king of Portugal

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

Charles IV, king of Hungary

(Encyclopedia)Charles IV, king of Hungary: see Charles I, emperor of Austria. ...

Ferdinand IV, king of Naples

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

John IV, king of Portugal

(Encyclopedia)John IV, 1604–56, king of Portugal (1640–56). He succeeded as duke of Braganza in 1630. Descended from Manuel I and in illegitimate line from John I, he had the strongest claim to the Portuguese t...

Abd al-Aziz IV

(Encyclopedia)Abd al-Aziz IV, 1880–1943, sultan of Morocco (1894–1908), son of Hassan. His weak control was evident after the death (c.1900) of the regent Ba Ahmed. His submissiveness to foreign influence, his ...

Louis IV, French king

(Encyclopedia)Louis IV or Louis d'Outremer lwē do͞otrəmĕrˈ [key] [Fr.,=Louis from overseas], 921–54, French king (936–54), son of King Charles III (Charles the Simple). He spent his youth as an exile in En...

Constantine IV, Byzantine emperor

(Encyclopedia)Constantine IV, c.652–685, Byzantine emperor (668–85), son and successor of Constans II. He defended Constantinople against the annual naval attacks of the Muslims, who finally withdrew in 678; Gr...