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balance of power

(Encyclopedia)balance of power, system of international relations in which nations seek to maintain an approximate equilibrium of power among many rivals, thus preventing the preponderance of any one state. Crucial...

Catherine of Braganza

(Encyclopedia)Catherine of Braganza brəgănˈzə [key], 1638–1705, queen consort of Charles II of England, daughter of John IV of Portugal. She was married to Charles in 1662. As part of her dowry England secure...

Doctrine of Signatures

(Encyclopedia)Doctrine of Signatures, the concept that the key to humanity's use of various plants was indicated by the form of the plant. The red sap of the bloodroot (Sanguinaria canadensis), for instance, was be...

energy, sources of

(Encyclopedia)energy, sources of, origins of the power used for transportation, for heat and light in dwelling and working areas, and for the manufacture of goods of all kinds, among other applications. The develop...

philosophy of science

(Encyclopedia)philosophy of science, branch of philosophy that emerged as an autonomous discipline in the 19th cent., especially through the work of Auguste Comte, J. S. Mill, and William Whewell. Several of the is...

Aymer of Valence

(Encyclopedia)Aymer of Valence āˈmər, vəlĕnsˈ, väläNsˈ [key], d. 1260, bishop of Winchester; son of Isabella (widow of King John of England) and Hugh X, count of La Marche. He was thus half-brother of King...

Azov, Sea of

(Encyclopedia)Azov, Sea of, Gr. Maiotis, Lat. Palus Maeotis, ancient Rus. Surozhskoye, northern arm of the Black Sea, c.14,000 sq mi (36,300 sq km), shared by S European Russia and E Ukraine. The shallow sea (maxim...

Pepin of Heristal

(Encyclopedia)Pepin of Heristal (Pepin II) pĕpˈĭn [key], d. 714, mayor of the palace (680–714) of the Frankish territory of Austrasia; grandson of Pepin of Landen and father of Charles Martel. After defeating...

Duris of Samos

(Encyclopedia)Duris of Samos do͞oˈrĭs [key], fl. 3d cent. b.c., Greek historian. A descendent of Alcibiades, Duris was tyrant of Samos for a time. He wrote Samian Chronicle—a history of Samos—and a rambling ...

Arras, Treaty of

(Encyclopedia)Arras, Treaty of. 1 Treaty of 1435, between King Charles VII of France and Duke Philip the Good of Burgundy. Through it, France and Burgundy became reconciled. Philip deserted his English allies and r...