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Hippolytus, Saint

(Encyclopedia)Hippolytus, Saint hĭpŏlˈĭtəs [key] [Gr.,=loosed horse], d. c.236, first antipope (c.217–235), theologian, and martyr. Probably a disciple of St. Irenaeus, he became the most astute theologian i...

Leo, in astronomy

(Encyclopedia)Leo [Lat.,=the lion], northern constellation lying S of Ursa Major and on the ecliptic (apparent path of the sun through the heavens) between Cancer and Virgo; it is one of the constellations of the z...

Tindemans, Leo

(Encyclopedia)Tindemans, Leo (Leonard Clemence Tindemans), 1922–2014, Belgian stateman. He studied economics at the universities of Antwerp and Ghent, and in 1958 became head of the Flemish Christian Democrats. F...

Esaki, Leo

(Encyclopedia)Esaki, Leo, 1925–, Japanese physicist, Ph.D. Univ. of Tokyo, 1959. Esaki was a researcher with IBM from 1960 until his retirement in 1992. He then served (1992–98) as president of the Univ. of Tsu...

Celestine I, Saint

(Encyclopedia)Celestine I, Saint sĕlˈəstĭn [key], d. 432, pope (422–32), an Italian; successor of St. Boniface I. The opposition of St. Cyril of Alexandria to Nestorianism inspired both sides to appeal to the...

Baekeland, Leo Hendrik

(Encyclopedia)Baekeland, Leo Hendrik bākˈlănd [key], 1863–1944, American chemist, b. Belgium, grad. Univ. of Ghent, 1882. In 1889 he emigrated to the United States. He founded (1893) and conducted, until 1899,...

Leo IV, Byzantine emperor

(Encyclopedia)Leo IV (Leo the Khazar), d. 780, Byzantine emperor (775–80), son and successor of Constantine V. He owed his nickname to his mother, a Khazar princess. Leo tempered the iconoclastic excesses of his ...

Patrick, Saint

(Encyclopedia)Patrick, Saint, c.385–461, Christian missionary, the Apostle of Ireland, b. Bannavem Taberniae (an unknown place in Britain, possibly near the Severn or in Pembroke). He was one of the most successf...

Leo I, Byzantine emperor

(Encyclopedia)Leo I, d. 474, Byzantine or East Roman emperor (457–74). Chosen by the senate to succeed Marcian, he sought to counteract the preponderance of Germans in the Roman army by enlisting Isaurians. A nav...

Leo III, Byzantine emperor

(Encyclopedia)Leo III (Leo the Isaurian or Leo the Syrian), c.680–741, Byzantine emperor (717–41). He was probably born in N Syria (rather than in Isauria, as once thought). He held diplomatic and military post...