Duncan Mac Duncan
- Born: 920, Elgin, Elginshire, Scotland
- Marriage (1): Leinster
- Marriage (2): Countess Halvda Sigurdsdatter before 950 in Europe
- Died: 965, Scotland aged 45
- Buried: Abt 1040, Scotland
FamilySearch ID: G7XJ-1LY.
Duncan married Leinster. (Leinster was born in 936 in Scotland and died in 958.)
Duncan next married Countess Halvda Sigurdsdatter, daughter of King Sigröður "hrisi" Haraldsson and Queen Dronning Vebjornsdottir, before 950 in Europe. (Countess Halvda Sigurdsdatter was born in 920 in Norway and died in 1018 in Norway.)
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