Analysis of information sources in references of the Wikipedia article "Si Thep Historical Park" in English language version.
TA-HTAUNG TA_YA HNIT-HSE SHIT-KHU DWARAWATI THEIN YA - 1128 year (= 1766 A.D) obtained at the conquest of Dwarawati (= Siam). One may note that in that year the Burmese invaded Siam and captured Ayutthaya, the capital, in 1767.
Ayutthaya, they still named the kingdom after its former kingdom as "Krung Thep Dvaravati Sri Ayutthaya".