Okay kiddo, Phya Anuman Rajadhon is a really smart man from Thailand who lived a long time ago. He was an expert in lots of different subjects like history, literature, and language.
He was so smart that he helped make a dictionary that showed people how to speak and write Thai words correctly. He also studied ancient Thai texts to learn more about Thailand's history and culture.
Phya Anuman Rajadhon liked to share his knowledge with people and teach them how to appreciate Thai culture. He even wrote some books and stories that are still popular today!
Even though Phya Anuman Rajadhon is no longer alive, we still remember him as a great thinker who helped us learn more about Thailand's past and present.