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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...

Gregory X

(Encyclopedia)Gregory X, d. 1276, pope (1271–76), an Italian named Tebaldo Visconti, b. Piacenza; successor of Clement IV. After Clement IV's death the cardinals took 34 months to elect a pope. Gregory was archde...

Lyons, First Council of

(Encyclopedia)Lyons, First Council of lyôNˈ [key], 1245, 13th ecumenical council of the Roman Catholic Church, convened at Lyons, France, by Pope Innocent IV to deal with his struggle with Holy Roman Emperor Fred...

Manfred

(Encyclopedia)Manfred mănˈfrəd, Ger. mänˈfrāt [key], c.1232–1266, king of Sicily (1258–66), the last Hohenstaufen on that throne. An illegitimate son of Holy Roman Emperor Frederick II, Manfred was regent...

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...

Ferdinand IV, Spanish king of Castile and León

(Encyclopedia)Ferdinand IV, 1285–1312, Spanish king of Castile and León (1295–1312), son and successor of Sancho IV. His mother, María de Molina, was regent during his turbulent minority. He tried unsuccessfu...

Alfonso IV, king of Portugal

(Encyclopedia)Alfonso IV, 1291–1357, king of Portugal (1325–57), son and successor of Diniz. Disgruntled by the favoritism his father showed toward Alfonso's illegitimate half-brothers, Alfonso rose in revolt i...

Louis IV, Holy Roman emperor

(Encyclopedia)Louis IV or Louis the Bavarian, 1287?–1347, Holy Roman emperor (1328–47) and German king (1314–47), duke of Upper Bavaria. After the death of Holy Roman Emperor Henry VII the Luxemburg party amo...

Henry IV, king of France

(Encyclopedia)Henry IV, 1553–1610, king of France (1589–1610) and, as Henry III, of Navarre (1572–1610), son of Antoine de Bourbon and Jeanne d'Albret; first of the Bourbon kings of France. Henry's marri...