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Ypres, battles of

(Encyclopedia)Ypres, battles of, three major engagements of World War I fought in and around the town of Ypres in SW Belgium. The first battle of Ypres (Oct.–Nov., 1914) was the last of the series of engagements ...

migration of animals

(Encyclopedia)migration of animals, movements of animals in large numbers from one place to another. In modern usage the term is usually restricted to regular, periodic movements of populations away from and back t...

Poissy, Colloquy of

(Encyclopedia)Poissy, Colloquy of pwäsēˈ [key], 1561, conference of Roman Catholic prelates and Protestant ministers, initiated by Catherine de' Medici and Michel de L'Hôpital in the hope of bringing about a pe...

Nicaea, empire of

(Encyclopedia)Nicaea, empire of, 1204–61. In 1204 the armies of the Fourth Crusade set up the Latin Empire of Constantinople, but the Crusaders' influence did not extend over the entire Byzantine Empire. Several ...

states of matter

(Encyclopedia)states of matter, forms of matter differing in several properties because of differences in the motions and forces of the molecules (or atoms, ions, or elementary particles) of which they are composed...

Basel, Council of

(Encyclopedia)Basel, Council of, 1431–49, first part of the 17th ecumenical council in the Roman Catholic Church. It is generally considered to have been ecumenical until it fell into heresy in 1437; after that i...

Isidorus of Miletus

(Encyclopedia)Isidorus of Miletus ĭzĭdôrˈəs, mīlēˈtəs [key], name of two architects of the time of Justinian. The elder was associated with Anthemius of Tralles in rebuilding Hagia Sophia, a.d. 532–37; t...

Tropic of Cancer

(Encyclopedia)Tropic of Cancer, parallel of latitude at 23°30′ north of the equator; it is the northern boundary of the tropics. This parallel marks the farthest point north at which the sun can be seen directly...

Blenheim, battle of

(Encyclopedia)Blenheim, battle of, major engagement of the War of the Spanish Succession (see Spanish Succession, War of the), fought on Aug. 13, 1704, at the village of Blenheim (Blindheim), near Höchstädt, Bava...

Troppau, Congress of

(Encyclopedia)Troppau, Congress of trôpˈou [key], 1820, international conference convened at the behest of Czar Alexander I of Russia under the provisions of the Quadruple Alliance. The congress, which met at Tro...