His biography is generally treated by historians as beginning with his violent seizure of the throne in 1113, since nothing reliable is known of his origin or early life; a Wikipedia infobox names Angkor, but its own body text and citation do not support this as a birth record.
What would resolve this An inscription or contemporary record naming his birthplace, independent of the assumption that a king born to rule at Angkor was born there.
OpenKhmer history; Angkorian epigraphyDivinity Atlas Open Questions Register, First Edition