Sunthorn Phu Day is on June 26 in Thailand. Sunthorn Phu was a famous Thai poet born on June 26, 1786, in Bangkok. He wrote many poems, and his most famous work is "Phra Aphai Mani," a long poem about a prince and his adventures. Sunthorn Phu had many jobs, like being a monk, and a clerk. He also worked as a teacher. On Sunthorn Phu Day, people read his poems and remember his life. He is important to Thai culture and history.