Constantine VII Porphyrogenitus (905-959) Byzantine emperor, son of LeoVI. Although he was crowned emperor in 911, for over 30 years he wasovershadowed by his father-in-law, the regent Romanus Lacapenus, who created his own sons co-emperors, but in 945, a struggle within this family allowed Constantine to seize sole power. A scholar rather than a ruler by nature, he wrote or compiled numerous works of history,including the life of his grandfather Basil I. (Larousse BiographicalDictionary, p 340)