কোন সাম্রাজ্যের কাছে খেমার সাম্রাজ্যের পতন ঘটে ?
The Siege of Angkor, also known as the Sack of Angkor or Fall of Angkor was a seven-month siege by the Kingdom of Ayutthaya on the Khmer capital of Angkor. After the Khmer refused to recognize Thai authority, the Thai besieged Angkor and sacked the capital city. The Khmer King Ponhea Yat fled the city to Basan and later to Krong Chaktomuk.
Though the Khmer Empire was already in decline, the conquest of Angkor delivered the final blow and the Khmer Empire fell. 
Though the Empire lived on as the Kingdom of Kambujadesa, it was reduced to a minor state in Southeast Asia and often became a vassal to larger neighbouring states.
Angkor was subsequently abandoned in the following centuries before being abandoned completely.
After the Fall of Angkor, the King moved the capital first to Basan and later to Krong Chaktomuk, initiating the period known as the Dark Ages of Cambodia.

Ayutthaya