It is tempting to suggest that either he, or his first cousin with the same name, spent time at the court of Edgar King of England during his youth, as "Malcolm dux" subscribed a charter of King Edgar relating to land in Cambridgeshire and Norfolk dated 970, but there is no proof of the co-identity of these persons.
The Annals of Tigernach record the death in 1034 of “Mael-Coluímb son of Cinaed king of Scotland”. The primary source which confirms her parentage and marriage has not yet been identified. m as his second wife, FINDLAECH Mac Rory Thane of Angus Mormaer of Moray, son of RUAIDHRI Mormaer of Moray & his wife --- (-1020).The Chronicle of the Scots and Picts dated 1177 records that "Malcolm mac Kynnat Rex" reigned for 30 years, died "in Glammes" and was buried "in Yona". King Malcolm III & his wife had [four] children: i) BETHOC . The Annals of Ulster record the death in 1020 of "Finnlaech son of Ruadrí king of Alba…killed by his own people".] Donada & her husband had one child: (a) MACBETH (-killed in battle Lumphanan, Aberdeenshire , bur Isle of Iona).The Chronicle of John of Fordun defended Cumbria against King Canute, who agreed that it should be ruled by Malcolm´s grandson Duncan.The Annals of Ulster record the death in 1034 of "Mael Coluim son of Cinaed, king of Scotland".The Chronicle of the Picts and Scots dated 1251 includes the same information. The "Genealogy of King William the Lyon" dated 1175 names "Betoch filii Malcolmi" as parent of "Malcolmi filii Dunecani". The 12th century Cronica Regum Scottorum lists "…Macheth filius Findleg xvii…" as king.