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Rh (i.-iv., 1888); L. D. Dowdall (i., ii., 1890). : P. Frost (1867); A. R. Cluer (1880); R. Kühner (1882); L. Breitenbach (1889); J. Marshall (1890). : H. A. Holden (1895); C. Graux and A. Jacob (1886). : H. A. Holden (1888). : R. W. Taylor (1880); O. Güthling (1888). A. Kirchhoff (1874); E. Belot (1880); H. Müller and Strübing (1880). : G. Pierleoni (1902). : Tommasini (1902). : A. Zurborg (1876). : L. Dindorf (1888). There is a good English translation of the complete works by H. G. Dakyns (1890–94), and of the Art of Horsemanship by M. H. Morgan (U.S.A., 1890). Of general works bearing on the subject may be mentioned: G. Sauppe, Lexilogus Xenophonteus (1869); A. Croiset, X., son caractère et son talent (1873); Roquette, De Xenophontis Vita (1884); I. Hartmann, Analecta Xenophontea (1887) and Analecta Xenophontea Nova (1889); C. Joël, Der echte und der Xenophonteische Socrates (1892); Lange, X.,, sein Leben, seine Geistesart und seine Werke (1900). See also : Ancient History, § “Authorities,” and works quoted; J. B. Bury, Ancient Creek Historians (1909); Mure's History of Greek Literature and Grant's monograph in Blackwood's Ancient Classics for English Readers may be read with advantage. Bibliographies in Engelmann-Preuss, Bibliotheca Scriptorum Classicorum (i., 1880) and in C. Bursian's Jahresbericht (c., 1900) by E. Richter.
 * G. Pierleoni (1905). :

 XERXES (the Greek form of the Pers. Khshayārshā; Old testament Ahasverus, Akhashverosh—i.e. (q.v.)—with wrong vocalization and substitution of y for v, instead of Akhshavarsh; in Aramaic inscriptions and papyri from Egypt the name is written Khshai'arsh), the name of two Persian kings of the Achaemenid dynasty.

1., son of Darius I. and Atossa, the daughter of Cyrus the Great, and therefore appointed successor to his father in preference to his eldest half-brothers, who were born before Darius had become king (Herod, vii. 2 f.). After his accession in October 485 he suppressed the revolt in Egypt which had broken out in 486, appointed his brother Achaemenes as satrap and “brought Egypt under a much heavier yoke than it had been before” (Herod, vii. 7). His predecessors, especially Darius, had not been successful in their attempts to conciliate the ancient civilizations. This probably was the reason why Xerxes in 484 abolished the “kingdom of Babel” and took away the golden statue of Bel (Marduk, Merodach), the hands of which the legitimate king of Babel had to seize on the first day of each year, and killed the priest who tried to hinder him. Therefore Xerxes does not bear the title of “King of Babel” in the Babylonian documents dated from his reign, but “King of Persia and Media,” or simply “King of countries” (i.e. of the world). This proceeding led to two rebellions, probably in 484 and 479; in the Babylonian documents occur the names of two ephemeral kings, Shamash-irbā and Tarziya, who belong to this time. One of these rebellions was suppressed by Megabyzus, son of Zopyrus, the satrap whom the Babylonians had slain.

Darius had left to his son the task of punishing the Greeks for their interference in the Ionian rebellion and the victory of Marathon. From 483 Xerxes prepared his expedition with great care: a channel was dug through the isthmus of the peninsula of Mount Athos; provisions were stored in the stations on the road through Thrace; two bridges were thrown across the Hellespont. Xerxes concluded an alliance with Carthage, and thus deprived Greece of the support of the powerful monarchs of Syracuse and Agrigentum. Many smaller Greek states, moreover, took the side of the Persians (“Medized”), especially Thessaly, Thebes and Argos. A large fleet and a numerous army were gathered. In the spring of 480 Xerxes set out from Sardis. At first Xerxes was victorious everywhere. The Greek fleet was beaten at Artemisium, Thermopylae stormed, Athens conquered, the Greeks driven back to their last line of defence at the Isthmus of Corinth and in the Bay of Salamis. But Xerxes was induced by the astute message of Themistocles (against the advice of Artemisia of Halicarnassus} to attack the Greek fleet under unfavourable

conditions, instead of sending a part of his ships to the Peloponnesus and awaiting the dissolution of the Greek armament. The battle of Salamis (28th of September 480) decided the war (see ). Having lost his communication by sea with Asia, Xerxes was forced to retire to Sardis; the army which he left in Greece under Mardonius was in 479 beaten at (q.v.). The defeat of the Persians at Mycale roused the Greek cities of Asia.

Of the later years of Xerxes little is known. He sent out Sataspes to attempt the circumnavigation of Africa (Herod, iv. 143), but the victory of the Greeks threw the empire into a state of languid torpor, from which it could not rise again. The king himself became involved in intrigues of the harem (cf. Herod, ix. 108 ff.—compare the late Jewish novel of Esther, in which a remembrance of the true character of the king is retained) and was much dependent upon courtiers and eunuchs. He left inscriptions at Persepolis, where he added a new palace to that of Darius, at Van in Armenia, and on Mount Elvend near Ecbatana; in these texts he merely copies the words of his father. In 465 he was murdered by his vizier (q.v.), who raised Artaxerxes I. to the throne.

2. Xerxes II., son and successor of Artaxerxes I., was assassinated in 424 after a reign of forty-five days by his brother Secydianus or Sogdianus, who in his turn was murdered by (q.v.).

See Ctesias, Pers. 44; Diod. xii., 64, 71, and the chronographers; neither of the two ephemeral kings is mentioned in the canon of Ptolemy nor in the dates of Babylonian contracts of this time.

The name was also borne by a king of Armenia, killed about 212 by Antiochus the Great (Polyb. viii. 25; Johannes Antiochenus, p. 53; his name occurs on copper coins); and by a son of Mithradates the Great of Pontus (Appian, Mithr. 108, 117).

 XIPHILINUS, JOANNES, epitomator of Dio Cassius, lived at Constantinople during the latter half of the 11th century He was a monk and the nephew of the patriarch of Constantinople of the same name, a well-known preacher (Migne, Patrologia Graeca, cxx.). The epitome of Dio was prepared by order of Michael Parapinaces (1071–1078), but is unfortunately incomplete. It comprises books 36–80, the period included being from the times of Pompey and Caesar down to Alexander Severus. In book 70 the reign of Antoninus Pius and the early years of Marcus Aurelius appear to have been missing in his copy, while in books 78 and 79 a mutilated original must have been used. Xiphilinus divided the work into sections, each containing the life of an emperor. He omitted the name of the consuls and sometimes altered or emended the original. The epitome is valuable as preserving the chief incidents of the period for which the authority of Dio is wanting.

See H. Reimar's edition of Dio Cassius, ii.; J. Melber's Dio in Teubner series; C. Wachsmuth, Einleitung in das Studium der alten Geschichte (1895); W. Christ, Geschichte der griechischen Litteratur (1808).

 X-RAY TREATMENT. The X rays (see ) are now used extensively in medical work for purposes of treatment. They have been found to be valuable in many forms of skin disease, more particularly in those of a chronic character. They have a favourable influence upon glandular tumours, as for example in enlargements of the lymphatic glands, of the spleen and of the thyroid gland. They give useful palliative effects in certain forms of malignant disease, although it is not yet certain that any permanent cures of cancerous conditions have been obtained by their use. In the disease known as rodent ulcer, which is a process of destructive ulceration, and to that extent presents features allied to cancer, there is no doubt of the efficacy of X-ray treatment for bringing about a complete cure in the majority of cases, provided that the disease has not advanced too deeply into the tissues. 