In 327 B.C. Alexander the Great after over-throwing the Persian Empire invaded India, where he remained only nineteen months. He probably intended to annex Sind and the Panjab permanently to his Empire but he died in 323 and in the next year Candragupta, an exiled scion of the royal house of Magadha, put an end to Macedonian authority in India and then seized the throne of his ancestors. He founded the Maurya dynasty under which Magadha expanded into an Empire comprising all India except the extreme south. Seleucus Nicator, who had inherited the Asiatic possessions of Alexander and wished to assert his authority, came into collision with Candragupta but was completely worsted and about 303 B.C. concluded a treaty by which he ceded the districts of Kabul, Herat and Kandahar. Shortly afterwards he sent as his ambassador to the court of Pataliputra a Greek named Megasthenes who resided there for a considerable time and wrote an account of the country still extant in a fragmentary form. The grandson of Candragupta was Asoka, the first ruler of all India (c. 273-231 B.C.). His Empire extended from Afghanistan almost to Madras and was governed with benevolent but somewhat grandmotherly despotism. He was an ardent Buddhist and it is mainly owing to his efforts, which are described in more detail below, that Buddhism became during some centuries the dominant faith in India. Asoka's Empire broke up soon after his death in circumstances which are not clear, for we now enter upon one of those chaotic periods which recur from time to time in Indian history and we have little certain information until the fourth century A.D. Andhra, a region including large parts of the districts now called the Northern Circars, Hyderabad and Central Provinces, was the first to revolt from the Mauryas and a dynasty of Andhra kings[115], who claimed to belong to the Śâtavâhana family, ruled until 236 A.D. over varying but often extensive territories. What remained of the Maurya throne was usurped in 184 B.C. by the Sungas who in their turn were overthrown by the Kaṇvas. These latter could not withstand the Andhras and collapsed before them about 27 B.C. Alexander's invasion produced little direct effect, and no allusion to it has been found in Indian literature. But indirectly it had a great influence on the political, artistic and religious development of the Hindus by preparing the way for a series of later invasions from the north which brought with them a mixed culture containing Hellenic, Persian and other elements. During some centuries India, as a political region, was not delimitated on the north-western side as it is at present and numerous principalities rose and fell which included Indian territory as well as parts of Afghanistan. These states were of at least three classes, Hellenistic, Persian or Parthian, and Scythian, if that word can be properly used to include the Sakas and Kushans.