Diogenianus () was a Greek grammarian from Heraclea in Pontus (or in Caria) who flourished during the reign of Hadrian (117âÂÂ138). He was the author of an alphabetical lexicon, chiefly of poetical words, abridged from the great lexicon () of Pamphilus of Alexandria (AD 50) and other similar works. It was also known by the title (âÂÂManual for those without meansâÂÂ). It formed the basis of the lexicon, or rather glossary, of Hesychius of Alexandria, which is described in the preface as a new edition of the work of Diogenianus. A collection of 776 proverbs under his name is still extant bearing the name àñÃÂÿùüïñù ô÷üÃÂôõùàá¼Âú ÃÂá¿ÂàÃÂùÿóõýùñýÿῦ ÃÂàýñóÃÂóá¿ÂÃÂ, probably an abridgment of the collection made by himself from his lexicon (ed. by Ernst von Leutsch and Friedrich Wilhelm Schneidewin in Paroemiographi Graeci, i. 1839). Diogenianus was also the author of an "Anthology of epigrams about rivers, lakes, cliffs, mountains and mountain ridges" (á¼ÂÃÂùóÃÂñüüìÃÂÃÂý á¼ÂýøÿûÃÂóùÿý ÃÂõÃÂὶ ÃÂÿÃÂñüῶý ûùüýῶý úÃÂ÷ýῶý á½ÂÃÂῶý á¼ÂúÃÂÃÂÃÂõùῶý), a list (with map) of all the towns in the world (ãàýñóÃÂóὴ úñὶ ÃÂïýñþ ÃÂῶý á¼Âý ÃÂìÃÂá¿ ÃÂῠóῠÃÂÃÂûõÃÂý)., and of a list of rivers (ÃÂõÃÂὶ ÃÂÿÃÂñüῶý úñÃÂá½° ÃÂÃÂÿùÃÂÃ栨Âÿý á¼ÂÃÂïÃÂÿüÿàá¼ÂýñóÃÂñÃÂî)
Erasmus in his Adagia (1508) attributes to Diogenianus the origins of the Latin proverb piscem natare doces (teach fish how to swim; Greek: ἸÃÂøὺý ýîÃÂõÃÂøñù ôùôìÃÂúõùÃÂ).
Diogenianus is the first person known to have referred to the parable of The Dog in the Manger.