Huygens, Christiaan. 1629-95. Dutch physicist, mathematician. Discovered Saturn’s rings 1655. Pendulum clock 1657. Centripetal force 1659. Conservation of Energy 1669. Wave theory of light 1678.

Hyde, Edward. 1609-74. English statesman, historian. Supported Charles II.

Hydra. Many-headed water serpent killed by Hercules.

Ibn Sa’ud. 1880-1953. Conqueror and king of Riyad 1902-, + Najd, Hasa, Asir, Hejaz; united as Saudi Arabia 1932-. Ended tribal wars. First oil wells 1933.

Iceland. 9C Irish discover. 870 Norway colonized. 930 Althing. 1262 Norway. 1380 Denmark 1904 Home rule. 1918 Sovereignty. 1944 Republic.

Ides of March. (March 15th). Day on which Caesar was assassinated.

Iliad. 8C BC. Homer’s epic of Trojan War.

Illyrian Wars. 229BC~219BC. Romans defeat Illyrian pirates. Greeks recognize Romans as civilized, admit them to games.

Income Tax. Britain: 1193 Walter to ransom Richard I. 1799-1815 To finance war vs Napoleon. 10% over £200; 1842 Peel 3%. US: 1862-72 3% over $800 (5% if outside US); 1913 over $3000 only.

India-Pakistan Wars. 1949. Splits Kashmir. 1965. India gains most of Rann of Kutch. 1971. Bangladesh Independence.

Indian Wars. 1794-1891. US expansion leads to native vs white conflicts.

Indochina War. 1946-54. Vietnamese Communists vs French and British occupying forces. =First Vietnam War.

Indulgence. 800 Pardon for sin in place of penance. Granted by church, 12C as reward to Crusaders. Sold by church, 1313-. Abuse by Leo X led to Reformation.

Inkerman, Battle. 1854. Crimean War defeat of Russians by English and French.

International. 1920-. Style of architecture. Glass and steel. Gropius. Le Corbusier.

International Brigades. 1936-9. 60,000 volunteers who opposed Franco in Spanish Civil War.

Investiture Controversy. 1075-1122. Gregory VII abolished Holy Roman Emperor’s power to invest bishops. Led to war with Henry IV. Concordat of Worms.

Iran-Iraq War. 1980-90. Iraq seeks oil rich Khuzestan. US supports war on Islamic regime.

Iraq. Mesopotamia. 1920 British mandate. 1921 Kingdom = Iraq. 1932 Independent. 1958 Arab Federation 1958 Left-wing coup, Republic. 1963 Anti-Communist coup. 1979 Hussein dictator. 1990 Kuwait Invasion.

Irish War. 1919-21. IRA fights for indepence. Irish Free State.

Ironclads. 1858-60. Iron-protected wooden warships.

Iroquois League. (League of 5 Nations). 1570-. Confederation of Mohawk, Oneida, Onondaga, Cayuga, Seneca. Fought for English in American Revolution, Seven Years War.

Irving, Washington. 1783-1859. US writer. Rip van Winkle. Legend of Sleepy Hollow 1819. Tales of a Traveller 1824. Inventor of short story.

Isabella. 1292-1358. Ousted husband Edward II in favour of son, Edward III, 1327.

Isabella of Bavaria. 1371-1435. French Queen consort/regent 1389-1422. Recognized British heir to French throne. Treaty of Troyes. Hundred Years War.

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