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Vladislav

(Encyclopedia)Vladislav vläˈdyĭsläf [key], Czech version of the name Ladislaus. Two kings of Bohemia who were thus named were Vladislav I (who was Ladislaus V, king of Hungary) and Vladislav II (who was Uladisl...

Murad II

(Encyclopedia)Murad II, 1403–51, Ottoman sultan (1421–51), son and successor of Muhammad I to the throne of the Ottoman Empire (Turkey). He was opposed at his accession by a pretender, Mustafa, who rapidly gain...

Jadwiga

(Encyclopedia)Jadwiga yädvēˈgä [key], 1374–99, Polish queen (1384–99), daughter of Louis I of Hungary and Poland. To satisfy Polish demands for autonomy at Louis's death, she reigned in Poland and her siste...

Matthias Corvinus

(Encyclopedia)Matthias Corvinus kôrvīˈnəs [key], 1443?–1490, king of Hungary (1458–90) and Bohemia (1478–90), second son of John Hunyadi. He was elected king of Hungary on the death of Ladislaus V. Holy R...

Varna

(Encyclopedia)Varna värˈnä [key], city (1993 pop. 307,200), E Bulgaria, on the Black Sea. It is a major port and an industrial center. Manufactures include ships and boats, chemicals, electrical equipment, and t...

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 ...

Piast

(Encyclopedia)Piast pyäst [key], 1st dynasty of Polish dukes and kings. Its name was derived from that of its legendary ancestor, a simple peasant. The first historic member, Duke Mieszko I (reigned 962–92), beg...