(M298) The largest of the Grecian States was the famous peninsula known as the Peloponnesus, entirely surrounded by water, except the isthmus of Corinth, four geographical miles wide. On the west was the Ionian Sea; on the east the Saronic Gulf and the Myrtoum Sea; on the north the Corinthian Gulf. It contained six thousand seven hundred and forty-five square miles. It was divided into several States. It was said to be left by Hercules on his death to the Heraclidæ, which they, with the assistance of the Dorians, ultimately succeeded in regaining, about eighty years after the Trojan war. Of the six States into which the Peloponnesus was divided, Achaia was the northernmost, and was celebrated for the Achæan league, composed of its principal cities, as well us Corinth, Sicyon, Phlius, Arcadia, Argolis, Laconia, Megaris, and other cities and States. (M299) Southwest of Achaia was Elis, on the Ionian Sea, in which stood Olympia, where the Olympic games were celebrated every four years, instituted by Hercules. (M300) Arcadia occupied the centre of the Peloponnesus, surrounded on all sides by lofty mountains—a rich and pastoral country, producing fine horses and asses. It was the favorite residence of Pan, the god of shepherds, and its people were famed for their love of liberty and music. (M301) Argolis was the eastern portion of the Peloponnesus, watered by the Saronic Gulf, whose original inhabitants were Pelasgi. It boasted of the cities of Argos and Mycenæ, the former of which was the oldest city of Greece. Agamemnon reigned at Mycenæ, the most powerful of the kings of Greece during the Trojan war. (M302) Laconia, at the southeastern extremity of the peninsula, was the largest and most important of the States of the Peloponnesus. It was rugged and mountainous, but its people were brave and noble. Its largest city, Sparta, for several generations controlled the fortune of Greece, the most warlike of the Grecian cities. (M303) Messenia was the southwestern part of the peninsula—mountainous, but well watered, and abounding in pasture. It was early coveted by the Lacedæmonians, inhabitants of Laconia, and was subjugated in a series of famous wars, called the Messenian. Such were the principal States of Greece. But in connection with these were the islands in the seas which surrounded it, and these are nearly as famous as the States on the main land.