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 "Geodesie de Heron de Byzance," published by Vincent in Notices et extraits des manuscrits de la Bibliotheque Imperiale, xix. 2 (Paris, 1858), and T. H. Martin in Memoires presentes Academie des Inscript i ons, 1st series, iv. (Paris, 1854).