Pavilion in the Bang Pa-In In Palace also called the Summer Palace .
The Royal Palace and Bang Pa-In has a history dating back to the 17th century. According to a chronicle of Ayutthaya, King Prasat Thong (1629 - 1656) had a palace constructed on Bang Pa-In Island in the Chao Phraya River. A contemporary Dutch merchant, Jeremias van Vliet, reported that King Prasat Thong was an illegitimate son of King Ekathotsarot (1605 - 1610/11), who in his youth was shipwrecked on that Island and had son by a woman who be friended him. The boy grew up to become a Chief Minister. After having usurped the throne, he became known as King Prasat Thong.