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biological diversity

(Encyclopedia)biological diversity or biodiversity, the number of species in a given habitat. Scientists have variously estimated that there are from 3 to 30 million extant species, of which 2.5 million have been c...

Armagnacs and Burgundians

(Encyclopedia)Armagnacs and Burgundians, opposing factions that fought to control France in the early 15th cent. The rivalry for power between Louis d'Orléans, brother of the recurrently insane King Charles VI, an...

European Commission

(Encyclopedia)European Commission (EC), institution of the European Union (EU) invested with executive powers; it also is the main EU institution that initiates legislation. Located in Brussels, Belgium, it was fou...

Poincaré, Raymond

(Encyclopedia)Poincaré, Raymond pwăNkärāˈ [key], 1860–1934, French statesman, president of France (1913–20); cousin of Jules Henri Poincaré. A member of the chamber of deputies from 1887, he held numerou...

Louisiana Purchase

(Encyclopedia)CE5 Louisiana Purchase (1803) Louisiana Purchase, 1803, American acquisition from France of the formerly Spanish region of Louisiana. Jefferson instructed Livingston to attempt to purchase the �...

Charles VI, Holy Roman emperor

(Encyclopedia)Charles VI, 1685–1740, Holy Roman emperor (1711–40), king of Bohemia (1711–40) and, as Charles III, king of Hungary (1712–40); brother and successor of Holy Roman Emperor Joseph I. Charles was...

Confederation, Articles of

(Encyclopedia)Confederation, Articles of, in U.S. history, ratified in 1781 and superseded by the Constitution of the United States in 1789. The imperative need for unity among the new states created by the America...

O'Connor, Rory

(Encyclopedia)O'Connor, Rory or Roderick, 1116?–1198, last high king of Ireland. He became king of Connacht in 1156 and seized the high kingship in 1166. His ascendancy was brief, however, for his quarrel with De...

Logan, James, chief of the Mingo

(Encyclopedia)Logan, James, c.1725–1780, chief of the Mingo, b. Pennsylvania. He took his name from James Logan (1674–1751) and is frequently called simply Logan. He was a leader of the Native Americans on the ...

Arthur III

(Encyclopedia)Arthur III, 1394–1458, duke of Brittany (1457–58), known before 1457 as comte de Richemont, constable of France in the Hundred Years War. He led the coalition that overthrew Georges de La Trémoil...