The new king, celebrated as the founder of Rattanakosin as the new capital of the reunited kingdom moves the political capital from Thonburi, across the Menam, to Rattanakosin Island, the historic center of Bangkok.

When he ascends to the throne in 1782, he takes the name Ramathibodi, just like the founder of the Ayutthaya Kingdom.

His full title is much longer (Phra Borommarachathirat Ramathibodi Sisin Borommaha Chakkraphat Rachathibodin etc.), intended to demonstrate his universal claim to power like of earlier Siamese kings.

A Lak Mueang (city pillar) is erected on Rattanakosin Island, located on the eastern bank of the Chao Phraya River, by order of King Rama I, an act considered the founding of the capital city of Bangkok.