There are very few sources for the reign of Dub, of which the Chronicle of the Kings of Alba and a single entry in the Annals of Ulster are the closest to contemporary.

The Latin material interpolated in Andrew of Wyntoun's Orygynale Cronykl states that he was murdered at Forres, and links this to an eclipse of the sun which can be dated to 20 July 966.

It has been suggested that Sueno's Stone, near Forres, may be a monument to Dub, erected by his brother Kenneth II (Cináed mac Maíl Coluim).

It is related that his body was hidden under the bridge of Kinloss, and the sun did not shine till it was found and buried.

Although his descendants did not compete successfully for the kingship of Alba after Kenneth was killed in 1005, Dub is likely an ancestor of the MacDuib (MacDuff) family who held the mormaerdom, and later earldom of Fife, until 1371.