monument built to commemorate Phraya Si Sunthonwoharn (Noi Ajarn Yangkun), who was born Paetrew and a precursor to the Thai language. Until receiving the nickname "Thai supreme court" philosopher His Thai language has given birth to many Thai language textbooks. which he is also the author of the first set of royal textbooks in Thailand known as "Royal Textbook" for teaching at Phra Tamnak Suankularb School including a book of poetry Many other valuable things Throughout his life, he has served closely with the royal family since the reign of King Rama III until the reign of King Rama V and has composed many works. both proverbs ceremonial proclamation Many Thai language textbooks, such as Munabot Banphakit, Wahanitinikorn, Aksornkanth, Sankayaokphithan, Vipotphichan, Phisankaran, which were the most complete Thai language textbooks of that era.