| | - Leo III, Saint
- pope from 795 to 816.
- Leo IV
- Byzantine emperor whose reign marked a transition between the period of Iconoclasm and the restoration of the icons.
- Leo IV, Saint
- pope from 847 to 855.
- Leo IX, Saint
- head of the medieval Latin church (1049-54), during whose reign the papacy became the focal point of western Europe and the great East-West Schism of 1054 became inevitable.
- Leo Minor
- constellation in the northern sky at about 10 hours right ascension and 35 north in declination. Its brightest star is 46 Leonis Minoris (sometimes called Praecipua, from the Latin for "Chief"), with a magnitude of 3.8. Polish astronomer Johannes Hevelius formed Leo Minor from stars between Ursa Major and Leo, ...
- Leo V
- pope from August to September 903. Elected while a priest to succeed Pope Benedict IV, Leo assumed the pontificate in a dark period of papal history. He was deposed and imprisoned by the antipope Christopher. Leo was perhaps murdered, either by Christopher or his successor, Pope Sergius III (904-911).
- Leo V
- Byzantine emperor responsible for inaugurating the second Iconoclastic period in the Byzantine Empire.
- Leo VI
- pope from May to December 928. He was Pope John VIII's prime minister and later a cardinal priest when elected by the senatrix Marozia, then head of the powerful Roman Crescentii family, who deposed and imprisoned Leo's predecessor, Pope John X. His principal act was the regulation of the jurisdiction ...
- Leo VI
- Byzantine coemperor from 870 and emperor from 886 to 912, whose imperial laws, written in Greek, became the legal code of the Byzantine Empire.
- Leo VII
- pope from 936 to 939. Leo was probably a Benedictine monk when he succeeded John XI, who had been imprisoned by Duke Alberic II of Spoleto. In 936 he invited Abbot St. Odo of Cluny (then one of the most influential abbeys in western Europe) to help him settle the ...
- Leo VIII
- pope, or antipope, from 963 to 965. The legitimacy of his election has long been debated.
- Leo X
- one of the leading Renaissance popes (reigned 1513-21). He made Rome a cultural centre and a political power, but he depleted the papal treasury, and, by failing to take the developing Reformation seriously, he contributed to the dissolution of the Western church. Leo excommunicated Martin Luther in 1521.
- Leo XI
- pope from April 1-27, 1605. Pope Gregory XIII made him bishop of Pistoia, Italy, in 1573, archbishop of Florence in 1574, and cardinal in 1583. Elected to succeed Clement VIII on April 1, 1605, he died within the month.
- Leo XII
- pope from 1823 to 1829.
- Leo XIII
- original name Vincenzo Gioacchino Pecci head of the Roman Catholic Church (1878-1903) who brought a new spirit to the papacy, manifested in more conciliatory positions toward civil governments, by care taken that the church not be opposed to scientific progress and by an awareness of the pastoral and social needs ...
- Leo, Heinrich
- Prussian conservative historian.
- Leo, Leonardo
- composer who was noted for his comic operas and who was instrumental in forming the Neapolitan style of opera composition.
- Leoben
- town, southeast-central Austria, on the Mur River, northwest of Graz. An ancient settlement, it was reestablished as a town by Ottokar II of Bohemia about 1263. Medieval buildings include the Maria am Waasen Church (12th century, rebuilt 15th century) with magnificent Gothic stained-glass windows, the parish church (1660-65), and the ...
- Leochares
- Greek sculptor to whom the Apollo Belvedere (Roman copy, Vatican Museum) is often attributed. About 353-c. 350 BC Leochares worked with Scopas on the Mausoleum of Halicarnassus, one of the Seven Wonders of the World. Most of his attributions are from ancient records. The base of a statue inscribed with ...
- Leofric
- Anglo-Saxon earl of Mercia (from 1023 or soon thereafter), one of the three great earls of 11th-century England, who took a leading part in public affairs. On the death of King Canute in 1035, Leofric supported the claim of Canute's son Harold to the throne against that of Hardecanute; and, ...
- Leogane
- city and port on the Gulf of Gonave, southwestern Haiti, lying approximately 20 miles (32 km) west of Port-au-Prince on the north shore of the country's southern peninsula. A former French colonial town, Leogane has long been the centre of a predominantly agricultural region. The city was near the epicentre ...
- Leominster
- town ("parish"), unitary authority and historic county of Herefordshire, west-central England, situated on the River Lugg, a tributary of the Wye. A religious house was founded on the site in 660, and the parish church of Saints Peter and Paul was the former priory church. The town was incorporated in ...
- Leominster
- city, Worcester county, north-central Massachusetts, U.S. It lies on the Nashua River, just southeast of Fitchburg and about 40 miles (64 km) northwest of Boston. The site, purchased from the Nashua Indians in 1701, was originally part of Lancaster. It was separately incorporated as a town in 1740 and named ...
- Leon
- city, northwestern Guanajuato estado (state), central Mexico. It stands in a fertile plain on the Turbio River, 6,182 feet (1,884 metres) above sea level. Although Leon was first settled in 1552, it was not formally founded until 1576 and was given city status in 1830. At that time the words ...
- Leon
- city, capital of Leon provincia (province) in Castile-Leon comunidad autonoma (autonomous community), northwestern Spain. It lies on the northwestern part of the northern Meseta Central (plateau), at the confluence of the Bernesga and Torio rivers.
- Leon
- provincia (province) in the Castile-Leon comunidad autonoma (autonomous community), northwestern Spain, consisting of the northern part of the former kingdom of Leon. In the north are the lofty Cantabrian Mountains, the highest peak of which is the Torrecerredo (8,688 feet [2,648 metres]). The natural regions are El Bierzo, a lowland ...
- Leon
- medieval Spanish kingdom. Leon proper included the cities of Leon, Salamanca, and Zamora-the adjacent areas of Vallodolid and Palencia being disputed with Castile, originally its eastern frontier. The kings of Leon ruled Galicia, Asturias, and much of the county of Portugal before Portugal gained independence about 1139.
- Leon
- city situated in western Nicaragua. The city of Leon was founded on the edge of Lake Managua in 1524, but after an earthquake it was moved in 1610 to the site of the old Indian capital and shrine of Sutiaba. Leon was the capital of the Spanish province and of ...
- Leon, Luis de
- mystic and poet who contributed greatly to Spanish Renaissance literature.
- Leonard, Benny
- American world lightweight (135-lb [61.2-kg]) boxing champion from May 28, 1917, when he knocked out Freddy Welsh in nine rounds in New York City, until Jan. 15, 1925, when he retired. He is regarded as one of the cleverest defensive boxers in the history of professional boxing.
- Leonard, Buck
- American baseball player who was considered one of the best first basemen in the Negro leagues. He was among the first Negro leaguers to receive election into the Baseball Hall of Fame.
- Leonard, Elmore
- American author of popular crime novels known for his use of local colour and his uncanny ear for realistic dialogue.
- Leonard, Sugar Ray
- American boxer, known for his agility and finesse, who won 36 of 40 professional matches and several national titles. As an amateur, he took an Olympic gold medal in the light-welterweight class at the 1976 Games in Montreal.
- Leonardo da Vinci
- Italian painter, draftsman, sculptor, architect, and engineer whose genius, perhaps more than that of any other figure, epitomized the Renaissance humanist ideal. His Last Supper (1495-98) and Mona Lisa (c. 1503-06) are among the most widely popular and influential paintings of the Renaissance. His notebooks reveal a spirit of scientific ...
- Leonardo da Vinci Museum of Science and Technology
- in Milan, museum devoted to the evolution of science since the 15th century, including transport, metallurgy, physics, and navigation. It is housed in the old Olivetan convent of San Vittore, which dates from the early 16th century. The building has fine frescoes by Bernardino Luini. The Leonardo Gallery contains models ...
- Leonardo da Vinci's parachute
- Leonardo da Vinci discussed the parachute in a notebook entry now contained in the Codex Atlanticus. Although it is unlikely that he actually tested his idea, a drawing by da Vinci in the codex shows a pyramid-shaped parachute and is accompanied by the following text:
- Leonardo Pisano
- medieval Italian mathematician who wrote Liber abaci (1202; "Book of the Abacus"), the first European work on Indian and Arabian mathematics.
- Leoncavallo, Ruggero
- Neapolitan opera composer whose fame rests on the opera Pagliacci, which, with Pietro Mascagni's Cavalleria rusticana (1890), represented a reaction against Richard Wagner and against Romantic Italian opera; both works substituted for the quasi-historical plot a sensational story from everyday life.
- Leone, Sergio
- motion-picture director known primarily for his popularization of the Italian "spaghetti western."
- Leoni, Leone
- Florentine sculptor, goldsmith, and medalist who had significant influence on Spanish sculpture.
- Leoni, Pompeo
- Italian late Renaissance sculptor and medalist who, like his father, Leone, was known for his expressive sculpture portraits.
- Leonidas
- Spartan king whose stand against the invading Persian army at the pass of Thermopylae in central Greece is one of the enduring tales of Greek heroism, invoked throughout Western history as the epitome of bravery exhibited against overwhelming odds.
- Leonidas of Tarentum
- Greek poet more important for his influence on the later Greek epigram than for his own poems. About 100 epigrams attributed to him survive, all but two collected in the Greek Anthology. They contain little personal information; he speaks of himself as an impoverished wanderer who expected to die far ...
- Leonidov, Leonid Mironovich
- Russian actor, director, and teacher who represented in his work and teaching the precepts of Konstantin Stanislavsky.
- Leonin
- leading liturgical composer of his generation, associated with the Notre Dame, or Parisian, school of composition.
- leonine verse
- Latin or French verse in which the last word in the line rhymes with the word just before the caesura (as in "gloria factorum temere conceditus horum"). Such rhymes were already referred to as rime leonine in the anonymous 12th-century romance Guillaume d'Angleterre. A later tradition imputes their invention to ...
- Leonov, Aleksey Arkhipovich
- Soviet cosmonaut who performed the first space walk.
- Leonov, Leonid Maksimovich
- Russian novelist and playwright who was admired for the intricate structure of his best narratives and for his ability to convey the complex moral and spiritual dilemmas faced by his characters. His multilayered, psychological approach was strongly influenced by-and often compared to-that of Fyodor Dostoyevsky.
- Leonowens, Anna Harriette
- British writer and governess employed by King Mongkut (Rama IV) of Siam for the instruction of his children, including his son and successor, Prince Chulalongkorn.
- Leontief, Wassily
- Russian-born American economist who has been called the father of input-output analysis in econometrics and who won the Nobel Prize for Economics in 1973.
- Leontini
- ancient Greek town of southeastern Sicily, 22 miles northwest of Syracuse. Originally held by the Sicels (Siculi), its command of the fertile plain on the north made it an attractive site to the Chalcidians from Naxos, who colonized it in 729 BC. Early in the 5th century Hippocrates of Gela ...
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