1911 Encyclopædia Britannica/Hero the Younger

HERO, the Younger, the name given without any sufficient reason to a Byzantine land-surveyor who wrote (about A.D. 938) a treatise on land-surveying modelled on the works of Hero of Alexandria, especially the Dioptra.

See “Géodésie de Héron de Byzance,” published by Vincent in Notices et extraits des manuscrits de la Bibliothéque Impériale, xix. 2 (Paris, 1858), and T. H. Martin in Mémoires présentés à l’ Académie des Inscriptions, 1st series, iv. (Paris, 1854).