After the death of his half-brother King Rama V in 1910, to whom Prince Damrong Rachanuphaap was a senior advisor, he worked mostly as a self-taught historian.

He became an author (fig.), writing books on Thai history, literature, culture and arts, and soon was dubbed the Father of Thai History.

After the 1932 revolution, he was exiled to Malaysia, and though being allowed to return to Thailand in 1942, he died a year later, on 1 December 1943, leaving the nation his literary oeuvre.