Valerius, a grammarian of Alexandria, in Egypt, respecting whose personal history nothing is known. Even the period during which he flourished is doubtful. Some have considered him to be the Greek instructor of the Emperor L. Verus, mentioned by Julius Capitolinus (*Life of Verus*, c. 2), while others have made Harpocratio live so late as A.D. 360, because several passages are found in his work taken from Athenaeus, who is supposed to have flourished about A.D. 300. Harpocration is the author of a very valuable lexicon on the ten orators, which contains a great deal of information on the law, history, antiquities, and general literature of Athens. The value of this work is much enhanced by the fact that all the authorities from which it has been compiled are lost. Suidas and the author of the *Etymologicum Magnum* have both borrowed from this work. Harpocration is also the author of a work entitled *Ἀθηναῖος Στεφάνων*, "Collection of Flowery Extracts" from various authors. The first edition of the lexicon was published along with Ulpian's *Scholia to the Philippics of Demosthenes*, by Aldus, Ven. 1503. Of subsequent editions, the best is that of Dindorf, Leipzig, 1824, 2 vols.; on which no improvements of much value will be found in the more recent one published by Bekker at Berlin in 1833.