[2] Oum Sum was born on February 12, 1918, in Chum Nap village, Chiros commune, Tboung Kmom district in Kampong Cham province.
[4] After the fall of Phnom Penh, he joined the forced march to Kampong Cham province where he was impelled to mix cow and buffalo manure as fertilizer.
Collecting old books and documents, Oum Sum also began reprinting pre-Khmer Rouge bestsellers such as work by Venerable Huot Tat, who had led the modernist approach since the 1920s.
[6][13] In 1994, he directed the fundraising effort to build a new stupa for the relics of Buddha previously kept in front of the Royal Railway Station in Phnom Penh and to move installed on top of the hill of Oudong, gathering over 1,5 million dollars.
After more than three months of lying in state, King Norodom Sihanouk ignited the fire initiating for the cremation of the Samdech Oum Sum on July 11, 2000, at Wat Botum.