HARPOCRATION, VALERIUS, Greek grammarian of Alexandria. He is possibly the Harpocration mentioned by Iulius Capitolinus (Life of Verus, 2) as the tutor of Antonius Verus (2nd century A.D.) ; some authorities place him much later, on the ground that he borrowed from Athenaeus. He is the author of AE teO (or Ilep TWV X EEEcov) ri w Uea finrOpcwv, a Lexicon or notes on well-known events and persons mentioned by the ten most famous orators, and explanations of legal and commercial expres sions. As nearly all the lexicons to the Greek orators have been lost, Harpocration's work, of which part is extant, is especially valuable. Amongst his authorities were the writers of Atthides (histories of Attica), the grammarian Didymus, Dionysius of Halicarnassus, and the lexicographer Dionysius, son of Tryphon. Nothing is known of an 'AvOrlpcov avva'ycoyrl a sort of anthology attributed to him by Suidas. A series of articles in the margin of a Cambridge ms. of the lexicon forms the basis of the Lexicon rhetoricum Cantabrigiense.