A news source revealed that he died three days after being admitted to Nopparat Rajathanee Hospital with Covid-19.
Born on May 24, 1929 in Ayutthaya, Sombat graduated from middle school and high school at Ayutthaya Witthayalai School and later earned a professional degree in primary education there.
During his teaching career, Sombat applied for a postal program in composition and journalism offered by Pluang Na Nakhon, a prominent scholar of literature and author of several dictionaries, who had prompted him to focus on the fact to become a writer.
Pluang then invited Sombat to work in the office of the National Culture Committee of the Ministry of Education with the task of writing articles, scripts for plays, documentaries and short stories for the journals of the ministry, as well as to host an educational radio show.
In 1985, Sombat took early retirement to become a full-time writer and was named a National Literary Artist in 2010.
He had written over 100 books on Thai history, culture, tradition, geography and biographies of historical figures. Among them are a biography of King Taksin the Great, Lao Ruang Bangkok (the Bangkok Chronicles), Lao Ruang Myanmar, and the Encyclopedia of Thai History.
Sombat is survived by his wife Jongkol and son Apijai.