Short answers, pulled from the story.
King Uthong established the Ayutthaya Kingdom in 1351 on an island in the Chao Phraya River. This new state emerged from a merger of three maritime city-states: Lopburi, Suphanburi, and Ayutthaya itself.
The four-century-old capital fell to invaders on the 7th of April 1767 after enduring fourteen months of siege. Palaces and temples were burned to ground and inhabitants were indiscriminately slaughtered with an estimated 200,000 Siamese dying during the war.
King Uthong founded the Ayutthaya Kingdom in 1351 through a merger of three maritime city-states including Lopburi, Suphanburi, and Ayutthaya itself. Archaeological surveys near Wat Khun Mueang Chai have found traces of buildings dating back to before 1100.
King Borommattrailokkanat shifted the kingdom from a maritime state to a hinterland state during the 15th and 16th centuries. His reforms promulgated in the Palatine Law of 1455 became the constitution of Ayutthaya for the rest of its existence.
The four-century-old capital fell to invaders on the 7th of April 1767 after enduring fourteen months of siege. The destruction was permanent and extensive with palaces and temples burned to ground and inhabitants slaughtered.