Rattanakosin Establishment
After the execution, the commander in chief assumed the throne of Thonburi kingdom as King Ramathibodi or Rama I. King Rama I removed his royal seat across the Chao Phraya river to the village of Bang-Koh (meaning "place of the island") which he had built. The new capital was established in 1782, named Rattanakosin. Then Thonburi diminished and became a part of the Bangkok metropolitan area.
Read more about this topic: Thonburi Kingdom