The outer wall measured 105 metres by 50 metres, had entrances on all sides and surrounded the whole complex. Today, we have only a moat on the north, west and south sides, but I presume that during the Ayutthaya era, the eastern moat was defined by Khlong Ayothya.
Following excavations conducted by the Fine Arts Department in 1999 - 2000 CE, the monastery has been restored three times and probably dates from before the establishment of Ayutthaya in 1351 CE.
At establishment, the main pagoda was more diminutive, as an octagonal base of the initial pagoda was found under the present base of the chedi during excavation.
King Thai Sa (reign 1709-1733 CE) restored the monastery. The main chedi was rebuilt larger in bell shape (Sri Lanka style) on a square base, replacing the original one. More pagodas were added. The ordination hall was built with pillars supporting the roof and walls like the ubosot of Wat Kudi Dao but without a porch in the front and the back. A rectangular vihara, 18 metres long by 10 metres wide, was constructed on the north side of the ubosot.
After the reign of King Thai Sa, various pagodas were added. The total number of satellite pagodas found is 29. The main chedi and the ubosot were slightly improved, and the floor behind the ubosot was elevated. The temple was deserted after the fall of Ayutthaya in 1767 CE.
Historical data about the monastery and its construction are unknown.
The site is in geographical coordinates: 14° 21' 52.63" N, 100° 35' 22.62" E.
Footnotes:
(1) Khlong Ayodhya, and in its extension, Khlong Kudi Dao, was an artificial short-cut canal running north-south and dug in a loop of the Pa Sak River, which riverbed later became Khlong Hantra. The canal is defunct today, but some small stretches can still be seen parallel with Road No 3058.
References:
[1] Alabaster, Henry (1871). The Wheel of The Law. London: Trubner & Co. p. 10/257.