Hyperīdes in Harpers Dictionary of Classical Antiquities
（Ὑπερείδης and Ὑπερίδης). One of the Ten Attic Orators, born about B.C. 390, son of the Athenian Glaucippus. He was a pupil of Plato and Isocrates, and won for himself an important position as a forensic and political orator, although his private life was not unblemished. As a statesman, he decidedly shared the views of Demosthenes, and was his steadfast ally in the struggle against the Macedonian party. It is true that he afterwards (B.C. 324) took part in the prosecution of Demosthenes, when accused of having taken bribes from Alexander's treasurer, Harpalus, and that he contributed to his condemnation on that charge. After the destruction of Thebes by Alexander (335 B.C.) it was only with difficulty that he and Demosthenes escaped being given up to the Macedonians. After the death of Alexander (323 B.C.) he was the chief instigator of the Lamian War, at the unfortunate conclusion of which he and Demosthenes (who had been reconciled to one another in the meantime) and other patriots were condemned to death by the Macedonian party. He fled for sanctuary to a temple in Aegina, but was dragged away from it by force, and by order of Antipater put to death at Corinth in 322.
Of the seventy-seven speeches which were known to antiquity as the work of Hyperides, only a few fragments were known until recent times; but in 1847, in a tomb at Thebes, in Egypt, extensive fragments were found of his speech against Demosthenes, together with a speech for Lycophron, and the whole of his oration for Euxenippus. In 1856 there was a further discovery in Egypt of an important part of the funeral oration delivered in 322 over those who had fallen in the siege of Lamia. In 1889 M. Eugène Revillout announced the purchase by the Louvre of a papyrus containing portions of the first oration of Hyperides against Athenogenes (Revue des Études Grecques, Jan.-March, 1889).
Though the speeches of Hyperides never attain to the force and depth of those of Demosthenes, nevertheless they were valued highly on account of the skill of their construction and the grace and charm of their expression. They are the productions of a practical pleader who is thoroughly in command of all his powers, and who is, above all, an accomplished man of the world-slightly indolent, witty, refined, with a delicious fund of irony, of perfect taste, entertaining and urbane. He is, oratorically speaking, to Demosthenes what Lord Salisbury is to Mr. Gladstone.
The text of Hyperides is edited by Blass in the Teubner series; and there is a good edition of the orations for Lycophron and Euxenippus by Babington, with fac-similes of the MSS. (Cambridge, 1853). The best account of his oratory is that of Blass in his Attische Beredsamkeit, iii. 2.1-72 (1877). See, also, Hager's Quaestiones Hyperideae (Leipzig, 1870); Caffiaux, Hypéride (Valenciennes, 1860); Jebb, The Attic Orators, ii. pp. 381-92 (London, 1876); and Böhnecke, Demosthenes, Lykurgos, Hyperides und ihr Zeitalter (Berlin, 1874).
Hypereides in Wikipedia
Hypereides (Greek Ὑπερείδης, Hypereidēs; c. 390–322 BCE) was a logographer (speech writer) in Ancient Greece. He was one of the ten Attic orators included in the "Alexandrian Canon" compiled by Aristophanes of Byzantium and Aristarchus of Samothrace in the third century BCE.
Rise to power
Little is known about his early life except that he was the son of Glaucippus, of the deme of Collytus and that he studied logography under Isocrates. In 360 BC he prosecuted Autocles for treason. During the Social War (358–355 BCE) he accused Aristophon, then one of the most influential men at Athens, of malpractices, and impeached Philocrates (343 BC) for high treason. Although Hypereides supported Demosthenes in the struggle against Phillip II of Macedon; that support was withdrawn after the Harpalus affair. After Demosthenes' exile Hypereides became the head of the patriotic party (324 BC).
After the death of Alexander the Great, Hypereides was one of the chief promoters of war against Macedonian rule. His speeches are believed to have led to the outbreak of the Lamian war (323–322 BCE) in which Athens, Aetolia, and Thessaly revolted against Macedon rule. After the decisive defeat at Crannon (322 BCE) in which Athens and her allies lost their independence, Hypereides and the other orators, were condemned to death by the Athenian supporters of Macedonia.
Hypereides fled to Aegina only to be captured at the temple of Poseidon. After being put to death his body (according to others) was taken to Cleonae and shown to the Macedonian general Antipater before being returned to Athens for burial.
Personality and oration style
Hypereides was an ardent pursuer of "the beautiful," which in his time generally meant pleasure and luxury. His temper was easy-going and humorous. Though in his development of the periodic sentence he followed Isocrates, the essential tendencies of his style are those of Lysias. His diction was plain, though he occasionally indulged in long compound words probably borrowed from the Middle Comedy. His composition was simple. He was especially distinguished for subtlety of expression, grace and wit. 
Seventy-seven speeches have been attributed to Hypereides, of which seventy-five were regarded as spurious by his contemporaries. It is said that a manuscript of most of the speeches survived as late as the 15th century in the library of Matthias Corvinus, king of Hungary, but was later destroyed after the capture of Buda by the Turks in the 16th century. Only a few fragments were known until relatively recent times. In 1847 large fragments of his speeches, Against Imosthenes and For Lycophron (incidentally interesting clarifying the order of marriage processions and other details of Athenian life, and the Athenian government of Lemnos) and the sole of the For Euxenippus (c. 330, a locus classicus on state prosecutions), were found in a tomb at Thebes in Egypt. In 1856 a considerable portion of a eulogy for Leosthenes and his comrades who had fallen in the Lamian war. Currently this is the best surviving example of epideictic oratory.
Towards the end of the nineteenth century further discoveries were made including the conclusion of the speech Against Philippides (dealing with an indictment for the proposal of unconstitutional measure, arising out of the disputes of the Macedonian and anti-Macedonian parties at Athens), and of the whole the Against Athenogenes (a perfumer accused of fraud in the sale his business).
In 2002 Natalie Tchernetska of Trinity College, Cambridge discovered fragments of two speeches of Hypereides that had been considered lost in the Archimedes Palimpsest. These were from the Against Timandros and Against Diondas. Tchernetska's discovery led to a publication on the subject in the Zeitschrift für Papyrologie und Epigraphik. This prompted the establishment of a working group under the auspices of the British Academy, which includes scholars from the UK, Hungary, and USA.
In 2006 the Archimedes Palimpsest project together with imagers at Stanford University used powerful X-ray fluorescence imaging to read the final pages of the Palimpsest, which contained the material by Hypereides. These were interpreted, transcribed and translated by the working group.
The new Hypereides revelations include two previously unknown speeches, effectively increasing the quantity of material known by this author by 20 percent. Previously most scholars believed only fragments of Hypereides survived beyond the Classical period.
Among the speeches not yet recovered is the Deliacus  in which the presidency of the Delian temple claimed by both Athens and Cos, which was adjudged by the Amphictyonic League to Athens. Also missing is the speech in which he defended the illustrious courtesan Phryne (said to have been his mistress) on a capital charge: according to Plutarch and Athenaeus the speech climaxed with Hypereides stripping off her clothing to reveal her naked breasts; in the face of which the judges found it impossible to condemn her.
William Noel, the curator of manuscripts and rare books at the Walters Art Museum in Baltimore, Maryland and the director of the Archimedes Palimpsest project, called Hypereides "one of the great foundational figures of Greek democracy and the golden age of Athenian democracy, the foundational democracy of all democracy." This assessement is obviously overblown: Hyperides was in no way a foundational figure, and Noel himself writes that he had never heard of him before the discovery of the new fragments (The Archimedes Codex, 223). The discrepancy shows Hyperides for what he was: an important figure in late fourth-century Athens.