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 Minor: a lofty chain in Mysia (Keshish Dagh), a ridge east of Smyrna (Nif Dagh), other mountains in Lycia, in Galatia, in Cilicia, in Cyprus, &c., were all called Olympus.

II. A lofty peak, rising high above the clouds of the lower atmosphere into the clear ether, seemed to be the chosen seat of the deity. In the Iliad the gods are described as dwelling on the top of the mountain; in the Odyssey Olympus is regarded as a more remote and less definite locality; and in later poets we find similar divergence of ideas, from a definite mountain to a vague conception of heaven. In the elaborate mythology of Greek literature Olympus was the common home of the multitude of gods. Each deity had his special haunts, but all had a residence at the court of Zeus on Olympus; here were held the assemblies and the common feasts of the gods.

III. There was a city in Lycia named Olympus; it was a bishopric in the Byzantine time.  OLYNTHUS, an ancient city of Chalcidice, situated in a fertile plain at the head of the Gulf of Torone, near the neck of the peninsula of Pallene, at some little distance from the sea, and about 60 stadia (7 or 8 m.) from Potidaea. The district had belonged to a Thracian tribe, the Bottiaeans, in whose possession the town of Olynthus remained till 479 In that year the Persian general Artabazus, on his return from escorting Xerxes to the Hellespont, suspecting that a revolt from the Great King was meditated, slew the inhabitants and handed the town over to a fresh population, consisting of Greeks from the neighbouring region of Chalcidice (Herod. viii. 127). Olynthus thus became a Greek polis, but it remained insignificant (in the quota-lists of the Delian League it appears as paying on the average 2 talents, as compared with 9 paid by Scione, 8 by Mende, 6 by Torone) until the synoecism ( ), effected in 432 through the influence of King Perdiccas of Macedon, as the result of which the inhabitants of a number of petty Chalcidian towns in the neighbourhood were added to its population (Thucyd. i. 58). Henceforward it ranks as the chief Hellenic city west of the Strymon. It had been enrolled as a member of the (q.v.) in the early days of the league, but it revolted from Athens at the time of its synoecism, and was never again reduced. It formed a base for Brasidas during his expedition (424). In the 4th century it attained to great importance in the politics of the age as the head of the Chalcidic League ( ). The league may probably be traced back to the period of the peace of Nicias (421), when we find the Chalcidians ( ) taking diplomatic action in common, and enrolled as members of the Argive alliance. There are coins of the league which can be dated with certainty as early as 405; one specimen may perhaps go back to 415–420. Unquestionably, then, the league originated before the end of the 5th century, and the motive for its formation is almost certainly to be found in the fear of Athenian attack. After the end of the Peloponnesian War the development of the league was rapid. About 390 we find it concluding an important treaty with Amyntas, king of Macedon (the father of Philip), and by 382 it had absorbed most of the Greek cities west of the Strymon, and had even got possession of Pella, the chief city in Macedonia (Xenophon, Hell. v. 2, 12). In this year Sparta was induced by an embassy from Acanthus and Apollonia, which anticipated conquest by the league, to send an expedition against Olynthus. After three years of indecisive warfare Olynthus consented to dissolve the confederacy (379). It is clear, however, that the dissolution was little more than formal, as the Chalcidians ( ) appear, only a year or two later, among the members of the Athenian naval confederacy of 378–377. Twenty years later, in the reign of Philip, the power of Olynthus is asserted by Demosthenes to have been much greater than before the Spartan expedition. The town itself at this period

is spoken of as a city of the first rank ( ), and the league included thirty-two cities. When war broke out between Philip and Athens (357), Olynthus was at first in alliance with Philip. Subsequently, in alarm at the growth of his power, it concluded an alliance with Athens; but in spite of all the efforts of the latter state, and of its great orator Demosthenes, it fell before Philip, who razed it to the ground (348).

The history of the confederacy of Olynthus illustrates at once the strength and the weakness of that movement towards federation which is one of the most marked features of the later stages of Greek history. The strength of the movement is shown both by the duration and by the extent of the Chalcidic League. It lasted for something like seventy years; it survived defeat and temporary dissolution, and it embraced upwards of thirty cities. Yet, in the end, the centrifugal forces proved stronger than the centripetal; the sentiment of autonomy stronger than the sentiment of union. It is clear that Philip’s victory was mainly due to the spirit of dissidence within the league itself, just as the victory of Sparta had been (cf. Diod. xvi. 53, 2 with Xen. Hell. v. 2, 24). The mere fact that Philip captured all the thirty-two towns without serious resistance is sufficient evidence of this. It is probable that the strength of the league was more seriously undermined by the policy of Athens than by the action of Sparta. The successes of Athens at the expense of Olynthus, shortly before Philip’s accession, must have fatally divided the Greek interest north of the Aegean in the struggle with Macedon.

 OMAGH, a market town and the county town of county Tyrone, Ireland, on the river Strule, 129 m. N.W. by N. from Dublin by the Londonderry line of the Great Northern railway, here joined by a branch from Enniskillen. Pop. (1901) 4789. The greater part of the town is picturesquely situated on a steep slope above the river. The milling and linen industries are carried on, and monthly fairs are held. The Protestant church has a lofty and handsome spire, and the Roman Catholic church stands well on the summit of a hill. A castle, of which there are scanty remains, was of sufficient importance to stand sieges in 1509 and 1641, being rebuilt after its total destruction in the first case. The town is governed by an urban district council.  OMAGUAS, or  (flat-heads), a tribe of South American Indians of the Amazon valley. Fabulous stories about the wealth of the Omaguas led to several early expeditions into their country, the most famous of which were those of George of Spires in 1536, of Philip von Hutten in 1541 and of Pedro de Ursua in 1560. In 1645 Jesuits began work. In 1687 Father Fritz, “apostle of the Omaguas,” established some forty mission villages. The Omaguas are still numerous and powerful around the head waters of the Japura and Uaupés.  OMAHA, the county-seat of Douglas county and the largest city in Nebraska, U.S.A., situated on the W. bank of the Missouri river, about 20 m. above the mouth of the Platte. Pop. (1880) 30,518, (1890) 66,536, (1900) 102,555, of whom 23,552 (comprising 5522 Germans, 3968 Swedes, 2430 Danes, 2170 Bohemians, 2164 Irish, 1526 English, 1141 English Canadians,