Macbeth defeats an attempt by the supporters…
1045 CE
Macbeth defeats an attempt by the supporters of Duncan’s son, Malcolm, to dethrone him when, in 1045, Duncan's father Crínán of Dunkeld (a scion of the Scottish branch of the Cenel Conaill and Hereditary Abbot of Iona) is killed in a battle between two Scottish armies.
After the defeat of Crínán, Macbeth is evidently unchallenged in his reign over Scotland.