Also called Chamolung by the Tibetans and sometimes Olypus Mons by some Romans, Sagar Mons was first sighted by Romans in 1803(1050). Its height was first approximated at 29 800pes (8820m) in 1909(1156) by an ADA trigonometric survey. It was first scaled in 1949(1196) by Serenus Shah (a Roman-Indian professional climber) and Namadi Wengali (a Nepalese guide). Over the next 15 years various Roman expeditions to its summit would succeed and fail, resulting in around 140 deaths by 1960(1207). A successful Khmer expedition in 1956(1203) was the first non-Roman ascent.