1. Leo the fifthsign of the zodiac, which the sun enters on July 22.
2. Leo the name of six emperors of the East, of which the chief was Leo III., surnamed the Isaurian, born in Isauria; raised to the imperialthrone by the army, defeated by sea and land the Saracens who threatened Constantinople; ruled peacefully for nine years, when he headed the iconoclastmovement (q. v.), which provoked hostility and led to the revolt of Italy from the Greek empire; d. 741.
3. Leo the names of 13 Popes: L. I., St., Pope from 410 to 461; L. II., St., Pope from 682 to 683; L. III., Pope from 795 to 816; L. IV., Pope from 847 to 855; L. V., Pope in 903; L. VI., Pope from 928 to 929; L. VII., Pope from 936 to 939; L. VIII., Pope from 963 to 965; L. IX., St., Pope from 1049 to 1054; L. X., Pope from 1513 to 1521; L. XI., Pope in 1605; L. XII., Pope from 1823 to 1829; L. XIII., Pope since 1878. Of these only the following deserve mention:—
Definitions of Leo 
