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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...

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, Saint, pope

(Encyclopedia)Leo IV, Saint, d. 855, pope (847–55), a Roman; successor of Sergius II. He had seen the Saracen attack on Rome (846), and to prevent its recurrence he fortified the city and its suburbs. He built a ...

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 ...

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...

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 ...

Breitenfeld

(Encyclopedia)Breitenfeld brīˈtənfĕltˌ [key], village, Saxony, S central E Germany. It gave its name to two battles of the Thirty Years War. Gustavus Adolphus (Gustavus II) of Sweden there defeated the imperia...

Wallenstein, Albrecht Wenzel Eusebius von

(Encyclopedia)Wallenstein or Waldstein, Albrecht Wenzel Eusebius von wälˈənstīn, Ger. älˈbrĕkht vĕnˈtsəl oizāˈbēo͝os fən välˈənshtīn, vältˈshtīn [key], 1583–1634, imperial general in the Thi...

Charles XIV, king of Sweden and Norway

(Encyclopedia)Charles XIV (Charles John; Jean Baptiste Jules Bernadotte) zhäN bäptēstˈ zhül bĕrnädôtˈ [key], 1763–1844, king of Sweden and Norway (1818–44), French Revolutionary general. Bernadotte ros...

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