Rama I
Military leader

Swiftly Taksin made a strategic plan and under it recaptured Ayutthaya in one year. In 1768 Taksin crowned himself and founded the Kingdom of Thonburi on the west bank of the mouth of the Chao Phraya river, using Thonburi as a new capital. Under the new Thonburi regime, Thongduang was appointed head of the royal police department, bearing the title Phra Ratcharin. After subjugating the warlord of Phimai with his brother Bunma (at that time called Phra Mahamontri, the future Maha Sura Singhanat), he was raised to Phraya Aphairanarit.

After the campaign to subdue the lord of Fang in 1769, Thongduang was raised to Phraya Yommarat and in the next year became Chao Phraya Chakri – the Samuhanayok (chief minister of the northern provinces). Chakri commanded the Siamese troops in the wars against Burma and went on to subjugate Cambodia. His brother Bunma (who by that time held the title of Phraya Anuchit Raja), accompanied him in various campaigns. Chakri and his brother were sent to the north to Lan Na in 1774 to free the kingdom from Burmese rule with the help of Phraya Kawila, a prince from Lampang. In 1776, he conquered Khmer Pa Dong (around modern Surin). He was assigned the task of conquering Lao kingdoms in 1778 and all the three kingdoms (Vientiane, Luang Prabang, Champasak) fell to the Siamese in the same year. He was eventually raised to Somdet Chao Phraya Maha Kasatsuek, the first official to ever hold this rank.
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