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Heron of Alexandria

(Encyclopedia)Heron of Alexandria hērˈŏn [key] or Hero, mathematician and inventor. The dates of his birth and death are unknown; conjecture places them between the 2d cent. b.c. and the 3d cent. a.d. He is beli...

Frederick I, elector of Brandenburg

(Encyclopedia)Frederick I, 1371–1440, elector of Brandenburg (1415–40), first of the Hohenzollerns (see Hohenzollern, family) to rule Brandenburg. As Frederick VI, burgrave of Nuremburg, he served under King Si...

Boleslaus III

(Encyclopedia)Boleslaus III, 1085–1138, duke of Poland (1102–38). The kingdom had been divided by his father, Ladislaus Herman, between Boleslaus and his elder brother Zbigniew, whose legitimacy was disputed. Z...

Gregory of Tours, Saint

(Encyclopedia)Gregory of Tours, Saint, 538–94, French historian, bishop of Tours (from 573), b. Clermont-Ferrand, of a prominent family. He had a distinguished and successful career as bishop. Gregory wrote accou...

Berlin, Free University of

(Encyclopedia)Berlin, Free University of, at Berlin, Germany; founded in 1948 by students and faculty seceding from Humboldt Univ. in East Berlin. Supported by both the city of Berlin and the German government, it ...

Group of Seventy Seven

(Encyclopedia)Group of Seventy Seven (G77), international organization, established in 1967 to promote economic cooperation and greater influence in world affairs among developing countries. Originally consisting o...

Rolle of Hampole, Richard

(Encyclopedia)Rolle of Hampole, Richard rōl [key], c.1300–c.1349, English religious writer, a Yorkshire hermit. He wrote mainly in Latin, but his English works are important for the history of the language. Some...

Margaret of Austria

(Encyclopedia)Margaret of Austria, 1480–1530, Hapsburg princess, regent of the Netherlands; daughter of Emperor Maximilian I. She was betrothed (1483) to the dauphin of France, later King Charles VIII, and was tr...

Tropic of Capricorn

(Encyclopedia)Tropic of Capricorn, parallel of latitude at 23°30′ south of the equator; it is the southern boundary of the tropics. This parallel marks the farthest point south at which the sun can be seen direc...

Matthias

(Encyclopedia)Matthias, 1557–1619, Holy Roman emperor (1612–19), king of Bohemia (1611–17) and of Hungary (1608–18), son of Holy Roman Emperor Maximilian II. He was appointed governor of Austria (1593) by h...