Rayong , Chantaburi , Trat , Nakhon Chai Si , Nakhon Pathom , Suphanburi , Ratchaburi , Samut Sakhon , Samut Songkhram , Phetchaburi , Kanchanaburi , and Prachuap Khiri Khan . Throughout his reign, King Taksin carried out his policy of expansion. In the north, including the whole of Lanna