The city was founded 1350 by the later King Ramathibodi I สมเด็จพระรามาธิบดีที่ 1 (also named U-Thong) at the confluence of three rivers: Chao Phraya, Lopburi and Pasak. The kings of Ayutthaya extended their power in the fourteenth and fifteenths centuries, conqueering former Khmer strongholds until they sacked their capital Angkor in 1431. During this process Khmer customs and architecture were assimilated into the style of Ayutthaya. The city developped into a bustling metropolis of international reputation. First Chinese, Vietnamese, Indian, Japanese and Persian visitors arrived. In the early sixteenth century Ayutthaya was discovered by European visitors, who had started circumnavigating the world. First came the Portuguese (1511), then the Dutch (1605), the English (1612), the Danes (1621) and the French (1662). Most visitors were merchants, some also engineers and military advisers. Ayutthaya became a hub for trade and the population in its best days was over a million - more than that of London at the same time. And the visitors brought home stories about palaces of gold, elegant teak homes and enormous wealth in the kingdom of Siam.