Kingdom of Desmond
The far northern slope of Mangerton was the site of a battle in 1262 between the Mac Cárthaigh (Gaelic forces, being the Kingdom of Desmond) and the FitzGeralds (Anglo-Norman forces, being the Geraldines), following the rout at the Battle of Callann Glen near Kilgarvan the previous year. The battle site is marked on the ordnance maps and also by a commemorative stone monument, and is known as Tooreencormick () after Cormac MacCarthy Reagh, who was killed during the clash (his brother Fínghin Mac Carthaigh had been killed at the Battle of Callann). Other notable knights including Gerald Roche, "the third best baron in Erin", were slain at Tooreencormick. Despite the losses, the battle is considered a MacCarthy success as the Anglo-Normans were kept out of South Kerry and West Cork (i.e. the Kingdom of Desmond), for the next three centuries.