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Chaumont(shōmōN`), town (1990 pop. 28,900), capital of Haute-Marne dept., NE France, in Champagne, at the confluence of the Marne and Saize rivers. It is a railroad and light industrial center. Iron is mined nearby. The Treaty of Chaumont, signed on Mar. 1, 1814, by England, Russia, Prussia, and Austria, laid the foundation for the Holy AllianceHoly Alliance,
1815, agreement among the emperors of Russia and Austria and the king of Prussia, signed on Sept. 26. It was quite distinct from the Quadruple Alliance (Quintuple, after the admission of France) of Great Britain, Russia, Austria, and Prussia, arrived at first in
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