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pi

(Encyclopedia)pi, in mathematics, the ratio of the circumference of a circle to its diameter. The symbol for pi is π. The ratio is the same for all circles and is approximately 3.1416. It is of great importance in...

Prescott, William Hickling

(Encyclopedia)Prescott, William Hickling, 1796–1859, American historian, b. Salem, Mass. He entered his father's law office, but was compelled by a serious eye injury to abandon law. He received medical attention...

Prado, Museo Nacional del

(Encyclopedia)Prado, Museo Nacional del präˈdō, Span. präˈᵺō [key], Spanish national museum of painting and sculpture, in Madrid, one of the finest in Europe. Situated on the Paseo del Prado, it was begun b...

Aragón

(Encyclopedia)Aragón ârˈəgŏn, Span. ärägōnˈ [key], autonomous community, 18,425 sq mi (47,720 sq km), and former kingdom, NE Spain, bordered on the N by France. The city of Z...

Moors

(Encyclopedia)Moors, nomadic people of the northern shores of Africa, originally the inhabitants of Mauretania. They were chiefly of Berber and Arab stock. In the 8th cent. the Moors were converted to Islam and bec...

Orléans, French royal family

(Encyclopedia)Orléans ôrlāäNˈ [key], family name of two branches of the French royal line. The house of Valois-Orléans was founded by Louis, duc d'Orléans (see separate article), whose assassination (1407) c...

Alfonso V, king of Portugal

(Encyclopedia)Alfonso V, 1432–81, king of Portugal (1438–81), son of Duarte and Queen Leonor. During his minority there was a struggle for the regency between the queen mother and Alfonso's uncle, Dom Pedro, du...

Alfonso VI, Spanish king of León and Castile

(Encyclopedia)Alfonso VI, 1030–1109, Spanish king of León (1065–1109) and Castile (1072–1109). He inherited León from his father, Ferdinand I. Defeated by his brother Sancho II of Castile, he fled to the Mo...

Charles I, emperor of Austria

(Encyclopedia)Charles I, 1887–1922, last emperor of Austria and, as Charles IV, king of Hungary (1916–18); son of Archduke Otto and grandnephew and successor of Emperor Francis Joseph. He married Zita of Bourbo...

Charles University

(Encyclopedia)Charles University, at Prague, Czech Republic; also called Univ. of Prague. The oldest and one of the most important universities of central Europe, it was founded in 1348 by Holy Roman Emperor Charle...