Its summit Mount Foster (2,025 m) was first climbed in 1996 by a New Zealand team led by Greg Landreth.

The range is named after Mount Imeon (present day Pamir, Hindu Kush, and Tian Shan), whose highlands and valleys around upper Oxus River (Amu Darya) were described as the ancient homeland of Bulgars by the seventh century Armenian geography index ‘Ashharatsuyts’ by Anania Shirakatsi.

The first ascent of the summit Mount Foster was made by Greg Landreth and his team comprising Brice Dowrick, Dan Mannix and Roger Thompson on 29–30 January 1996.

[4] Antim Peak was first ascended by the French mountaineers Mathieu Cortial, Lionel Daudet and Patrick Wagnon on 12 January 2010.

Their route called Le vol du sérac (Flight of the Serac) followed the western spur of the peak.