Originally founded by King U-Thong in 1350 within a bend of the Chao Phraya river,
Ayutthaya was the capital of the Thai kingdom at its mightiest. The modern city was founded a few kilometers further east.
Ayutthaya was originally known as "Ayothaya" which refers to the capital of King Rama (see Ramayana). When King Naresuan the Great defeated the Burmese, he changed the name of the city to "Aytthaya" meaning "the undefeatable city". The Bowring Treaty (1855), signed by King Mogkhut between Siam and Britain, was the first of its kind and successfully opened up Siam to Western influence and trade.
The ruins of the old capital in the Ayutthaya historical park are now a UNESCO World Heritage Site. Among Thai cities, Ayutthaya's English name is probably the least standardized - it is also known as Ayotaya, Ayothaya, Ayudhya, Ayutaya, Ayuthaya and Ayuttaya.
