Wat Yai Chai Mongkol is located near the main Ayutthaya ruins and a short distance from the walls of Ayutthaya. It is famed for an impressively large statue of the Reclining Buddha inside the temple compound. Built by King U Thong (Ayutthaya’s first ruler) in 1357, the temple is also known as "Chao Phaya Thai Temple" and has a large Chedi that dominates the skyline. The Chedi was built in 1592 to celebrate King Naresuan’s single-handed defeat of the then Burmese Crown Prince after an elephant back duel. The size of the Chedi was intended to match that of Phu Khao Thong – a Pagoda purportedly built by the Burmese which is visible in the distance from the temple.
The temple became the home of Buddhist monks ordained and trained at the Monastery
of Phra Wanaratanathen in Ceylon (present Sri Lanka). The Sangha group was mainly
engaged in meditation. The king conferred the title of "Right side Supreme Patriarch” to the head of the group, Somdet Phra Wanarat. The monastery became known as “Wat Chao Phya Thai” - The Monastery of the Supreme Patriarch.
In 1592 King Naresuan (r. 1590-1605) defeated the Burmese Army at Nong Sarai by
killing the Burmese Crown Prince in single-handed combat on elephant. In the battle the King and his brother King Ekathotsarot got separated from their army officers. On return to Ayutthaya the King wanted to punish to death his officers, but the Supreme Patriarch intervened and requested the punishment to be suspended; which King Naresuan granted. “The Royal Chronicles of Ayutthaya” although, state nothing about the construction of the great chedi. It is assumed that, on this occasion, King Naresuan ordered the restoration and enlargement of the temple and the principal chedi. The chedi was named Phra Chedi Chaya Mongkhon. Presumably this celebration gave rise to the temple’s new name, Wat Yai Chaya Mongkhon - The Great Temple of Auspicious Victory.
This is a great site to visit and wander around so give yourself plenty of time for a visit.
