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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...

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...

John IV, Byzantine emperor of Nicaea

(Encyclopedia)John IV (John Lascaris) lăsˈkərĭs [key], b. c.1250, d. after 1273, Byzantine emperor of Nicaea (1258–61), son and successor (under a regency) of Theodore II and last of the Lascarids. Michael Pa...

Saudi Arabia

(Encyclopedia)CE5 Saudi Arabia säo͞oˈdē ərāˈbēə, souˈ–, sô– [key], officially Kingdom of Saudi Arabia, kingdom (2015 est. pop. 27,752,000), 829,995 sq mi (2,149,690 sq km), comprising most of the ...

Ladislaus IV, king of Poland

(Encyclopedia)Ladislaus IV, 1595–1648, king of Poland (1632–48), son and successor of Sigismund III. His reign was marked by struggles with his subjects and wars with the Swedes, the Russians, and the Ottomans....

Sancho IV, Spanish king of Castile and León

(Encyclopedia)Sancho IV (Sancho the Brave) sänˈchō [key], 1257?-1295, Spanish king of Castile and León (1284–95), son and successor of Alfonso X. On the death (1275) of his elder brother, Ferdinand de la Cerd...

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