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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...

Malcolm X

(Encyclopedia)Malcolm X, 1925–65, militant black leader in the United States, also known as El-Hajj Malik El-Shabazz, b. Malcolm Little in Omaha, Neb. A petty crimi...

Abd ar-Rahman III, emir and caliph of Córdoba

(Encyclopedia)Abd ar-Rahman III, 891–961, Umayyad emir (912–29) and first caliph (929–61) of Córdoba. When he succeeded to the throne, the Spanish emirate was reduced to Córdoba and its environs and beset w...

bin Laden, Osama

(Encyclopedia)bin Laden, Osama or Usama ōsäˈmə bĭn lädˈən, ŭsäˈmə [key], 1957?–2011, Saudi-born leader of Al Qaeda, a terrorist organization devoted to uniting all Muslims and establishing a transnati...

Abdül Hamid

(Encyclopedia)Abdül Hamid. For Ottoman sultans thus named, use Abd al-Hamid.

Fatimid

(Encyclopedia)Fatimid –ĭmīt [key], dynasty claiming to hold the caliphate on the basis of descent from Fatima, a daughter of Muhammad the Prophet. In doctrine the Fatimids were related to other Shiite sects. Th...