Pisistratus however did not retain his power long. The leaders of the factions of the Shore and the Plain combined and drove the usurper into exile. But the Shore and the Plain having quarrelled, Pisistratus was recalled and again became master of Athens. Another revolution shortly afterwards drove him into exile a second time, and he remained abroad ten years. At length, with the assistance of mercenaries from other Grecian states and with the aid of his partisans in Athens, he became master of Athens for the third time, and henceforth continued in possession of the supreme power till the day of his death. As soon as he was firmly established in the government, his administration was marked by mildness and equity. He maintained the institutions of Solon, taking care, however, that the highest offices should always be held by some members of his own family. He not only enforced strict obedience to the laws, but himself set the example of submitting to them. Being accused of murder, he disdained to take advantage of his authority, and went in person to plead his cause before the Areopagus, where his accuser did not venture to appear. He courted popularity by largesses to the citizens and by throwing open his gardens to the poor. He adorned Athens with many public buildings. He commenced on a stupendous scale a temple to the Olympian Zeus, which remained unfinished for centuries, and was at length completed by the emperor Hadrian. He was a patron of literature, as well as of the arts. He is said to have been the first person in Greece who collected a library, which he threw open to the public; and to him posterity is indebted for the collection of the Homeric poems. On the whole it cannot be denied that he made a wise and noble use of his power. Pisistratus died at an advanced age in 527 B.C., thirty-three years after his first usurpation. He transmitted the sovereign power to his sons, Hippias and Hipparchus, who conducted the government on the same principles as their father. Hipparchus inherited his father's literary tastes. He invited several distinguished poets, such as Anacreon and Simonides, to his court. The people appear to have been contented with their rule; and it was only an accidental circumstance which led to their overthrow and to a change in the government.