The inscription in which the name Dharmasraya and the name of king is Srimat Tribhuwanaraja Mauli Warmadewa appears dates from the 13th century, namely the Padang Roco inscription discovered around the headwaters of Batanghari river (now Dharmasraya Regency in West Sumatera), dated 1286.
Usman was born the fourth of nine children in Mersam, Batanghari, Sumatra in 1943 during the Japanese occupation of Indonesia from a union between his father, H. Usman Abul, of Minangkabau descent and his mother, Cholijah, who was Malayu.
The Padang Roco Inscription, in Indonesian Prasasti Padang Roco, is an inscription dated 1286 CE, discovered near the source of Batanghari river, Padangroco temple complex, Nagari Siguntur, Sitiung, Dharmasraya Regency, West Sumatra, Indonesia.