The principal cities of India at this date were Ayodhya, the capital of Kosala at the time of the Ramayana, though it afterwards gave place to Sravasti, which was one of the six great cities of India in the time of Buddha: archaeologists differ as to its position. Baranasi, the modern Benares, had in the time of Megasthenes a circuit of 25 m. Kosambi, the capital of the Vamsas, lay on the Jumna, 230 m. from Benares. Rajagriha (Rajgir), the capital of Magadha, was built by Bimbisara, the contemporary of Buddha. Roruka, the capital of Sovira, was an important centre of the coasting trade. Saketa was sometime the capital of Kosala. Ujjayini, the modern Ujjain, was the capital of Avanti. None of these great cities has as yet been properly excavated. Social life. In those early days the Aryan tribes were divided into four social grades on a basis of colour: the Kshatriyas or nobles, who claimed descent from the early leaders; the Brahmans or sacrificing priests; the Vaisyas, the peasantry; and last of all the Sudras, the hewers of wood and drawers of water, of non-Aryan descent. Even below these there were low tribes and trades, aboriginal tribes and slaves. In later documents mention is made of eighteen gilds of work-people, whose names are nowhere given, but they probably included workers in wood, workers in metal, workers in stone, weavers, leather-workers, potters, ivory-workers, dyers, fisher-folk, butchers, hunters, cooks, barbers, flower-sellers, sailors, basket-makers and painters. It is supposed that sea-going merchants, mostly Dravidians, and not Aryans, availing themselves of the monsoons, traded in the 7th century B.C. from the south-west ports of India to Babylon, and that there they became acquainted with a Semitic alphabet, which they brought back with them, and from which all the alphabets now used in India, Burma, Siam and Ceylon have been gradually evolved. For the early inscriptional remains, see INSCRIPTIONS: _India_. The earliest written records in India, however, are Buddhist. The earliest written books are in Pali and Buddhist Sanskrit. _The Buddhist Period._ The systems called Jainism (see JAINS) and Buddhism (q.v.) had their roots in prehistoric philosophies, but were founded respectively by Vardhamana Mahavira and Gotama Buddha, both of whom were preaching in Magadha during the reign of Bimbisara (c. 520 B.C.).