Born as Phra Ong Chao Tisavarakumarn (Prince Tisavarakumarn), Tisavarakumarn Damrong Rajanubhab (21 June 1862 - 1 December 1943) was the son of King Mongkut with Consort Chum, a lesser royal wife. At the age of 14, he received his formal education in a palace school created by his half-brother, King Chulalongkorn. At age 18 he become the commander of the Royal Guards Regiment, and after seven years working in modernizing the army he was appointed as Grand-officer (commander-in-chief).
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