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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 ...

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...

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...

Charles the Bold

(Encyclopedia)Charles the Bold, 1433–77, last reigning duke of Burgundy (1467–77), son and successor of Philip the Good. As the count of Charolais before his accession, he opposed the growing power of King Loui...

Philip of Swabia

(Encyclopedia)Philip of Swabia swāˈbēə [key], 1176?–1208, German king (1198–1208), son of Holy Roman Emperor Frederick I. After the death (1197) of his brother, German King and Holy Roman Emperor Henry VI, ...

European Free Trade Association

(Encyclopedia)European Free Trade Association (EFTA), customs union and trading bloc; its current members are Iceland, Liechtenstein, Norway, and Switzerland. EFTA was established in 1960 by Austria, Denmark, Great...

Viborg, city, Denmark

(Encyclopedia)Viborg vēˈbôr [key], city (1992 pop. 29,867), capital of Viborg co., N central Denmark. It is a commercial and industrial center and a rail junction. Manufactures include tobacco, textiles, beer, a...

Golden Bull

(Encyclopedia)Golden Bull, term translated from the Latin bulla aurea and generally referring to a bull (edict) with a golden seal. Golden bulls were promulgated by medieval Byzantine rulers and by Western European...

Oldenburg, former state, Germany

(Encyclopedia)Oldenburg ôlˈdənbo͝orkh [key], former state, NW Germany. It is now included in the state of Lower Saxony. The city of Oldenburg was the capital. The former state consisted of three widely separate...