sentences:  According to the late fourteenth-century "Bruce", Aonghus Óg participated in the Battle of Bannockburn in 1314, Robert I's greatest victory over the English.It is uncertain when Aonghus Óg died.It could have been before or after the death of an unknown member of the clan at the Battle of Faughart in 1318—a man who seems to have held the chiefship at the time.