Another federation formed among port towns on the lower reaches of the rivers in the Chaophraya basin, and around the upper coasts of the gulf, especially four place which had been founded or refounded under Khmer influence around the eleventh century: Phetchaburi, Suphanburi, Lopburi, and Ayutthaya emerged as the dominant centre in the late fourteenth century.The Chinese called this region Xian, Which the Portuguese converted into Siam