Uparat
Chui was born to Chao Phraya Chakri (future King Phutthayotfa Chulalok or Rama I) and his wife Nak (future Queen Amarindra) in 1773. In 1782, Chao Phraya Chakri crowned himself as the first monarch of the Chakri dynasty of Siam at Bangkok. Chui was then made a prince. He was later awarded the title "Krom Khun" Senanurak. Prince Senanurak was known to be close to his only true brother Prince and Front Palace Isarasundhorn (future Buddha Loetla Nabhalai or Rama II). In 1807 Prince Isarasundhorn made his brother Prince Senanurak his successor to the Front Palace (). In 1809, King Phutthayotfa Chulalok died. As a result the Front Palace Isarasundhorn ascended the throne as King. The new King appointed Prince Senanurak as the next the Front Palace lord, and as his successor.