Seleucus Nicator (312-280 B.C.), besides being a ruler of unusual ability, was a most liberal patron of learning and art. He is declared to have been "the greatest founder of cities that ever lived." Throughout his dominions he founded a vast number, some of which endured for many centuries. Antioch, on the Orontes, in Northern Syria, became, after Seleucia on the Tigris, the capital of the kingdom, and obtained an influence and renown as a centre of population and trade which have given its name a sure place in history. The successors of Seleucus Nicator led the kingdom through checkered fortunes. On different sides provinces fell away and became independent states. [Footnote: The most important of these were the following:--1. PERGAMUS.--This was a state in western Asia Minor, which became independent upon the death of Seleucus Nicator (280 B.C.). Favored by the Romans, it gradually grew into a powerful kingdom, which at one time embraced a considerable part of Asia Minor. Its capital, also called Pergamus, became a most noted centre of Greek learning and civilization. 2. PARTHIA.--Parthia was a powerful Turanian state that grew up east of the Euphrates River (from about 255 B.C. to 226 A.D.). Its kings were at first formidable enemies of the rulers of Syria, and later of the Romans, whom they never allowed to make any considerable conquest beyond the Euphrates.] Antiochus III. (223-187 B.C.), called "the Great," raised the kingdom for a short time into great prominence; but attempting to make conquests in Europe, and further, giving asylum to the Carthaginian general Hannibal, he incurred the fatal hostility of Rome. Quickly driven by the Roman legions across the Hellespont, he was hopelessly defeated at the battle of Magnesia (190 B.C.). After this, the Syrian kingdom was of very little importance in the world's affairs. At last, brought again into collision with Rome, the country was overrun by Pompey the Great, and became a part of the Roman Republic, 63 B.C. [Illustration: COIN OF ANTIOCHUS III. (THE GREAT).] [Illustration: PTOLEMY SOTER.] KINGDOM OF THE PTOLEMIES IN EGYPT (323-30 B.C.).--The Græco-Egyptian empire of the Ptolemies was by far the most important, in its influence upon the civilization of the world, of all the kingdoms that owed their origin to the conquests of Alexander. The founder of the house and dynasty was Ptolemy I., surnamed Soter (323-283 B.C.), one of Alexander's ablest generals. His descendants ruled in Egypt for nearly three centuries, a most important period in the intellectual life of the world. Under Ptolemy I., Alexandria became the great depot of exchange for the productions of the world. At the entrance of the harbor stood the Pharos, or light- house,--the first structure of its kind,--which Ptolemy built to guide the fleets of the world to his capital. This edifice was reckoned one of the Seven Wonders.