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William I, king of England
(Encyclopedia)William I or William the Conqueror, 1027?–1087, king of England (1066–87). Earnest and resourceful, William was not only one of the greatest of English monarchs but a pivotal figure in European hi...AIDS, in medicine
(Encyclopedia)AIDS or acquired immunodeficiency syndrome, fatal disease caused by a rapidly mutating retrovirus that attacks the immune system and leaves the victim vulnerable to infections, malignancies, and neuro...Nicholas II, czar of Russia
(Encyclopedia)Nicholas II, 1868–1918, last czar of Russia (1894–1917), son of Alexander III and Maria Feodorovna. Discontent at home grew, the army tired of war, the food situation deteriorated, the governme...Henry II, king of England
(Encyclopedia)Henry II, 1133–89, king of England (1154–89), son of Matilda, queen of England, and Geoffrey IV, count of Anjou. He was the founder of the Angevin, or Plantagenet, line in England and one of the a...airship
(Encyclopedia)airship, an aircraft that consists of a cigar-shaped gas bag, or envelope, filled with a lighter-than-air gas to provide lift, a propulsion system, a steering mechanism, and a gondola accommodating pa...Wittelsbach
(Encyclopedia)Wittelsbach vĭˈtəlsbäkh [key], German dynasty that ruled Bavaria from 1180 until 1918. The family takes its name from the ancestral castle of Wittelsbach in Upper Bavaria. In 1180 Holy Roman Emper...knight
(Encyclopedia)knight, in ancient and medieval history, a noble who did military service as a mounted warrior. As the feudal system disintegrated, knight service was with growing frequency commuted into cash pay...science fiction
(Encyclopedia)science fiction, literary genre in which a background of science or pseudoscience is an integral part of the story. Although science fiction is a form of fantastic literature, many of the events recou...Netherlands, Austrian and Spanish
(Encyclopedia)Netherlands, Austrian and Spanish, that part of the Low Countries that, from 1482 until 1794, remained under the control of the imperial house of Hapsburg. The area corresponds roughly to modern Belgi...numeral
(Encyclopedia)numeral, symbol denoting anumber. The symbol is a member of a family of marks, such as letters, figures, or words, which alone or in a group represent the members of a numeration system. The earliest ...Browse by Subject
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