Maha Senanurak

Somdet Phra Bawornrajchao Maha Senanurak was the Front Palace appointed by Buddha Loetla Nabhalai as the titular heir to the throne as he was the brother to the king. Maha Senanurak was known for his leadership of Siamese campaign against Burmese invasion of Thalang in 1809.

Chui was born to Chao Phraya Chakri and his wife Nak 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 . In 1807 Prince Isarasundhorn made his brother Prince Senanurak as 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 and Vice King, and also as his successor.

Source: Wikipedia