Family/Spouse: Helen. Helen (daughter of Llywelyn Fawr the Great ap Iowerth, Prince of Wales and Tangwystyl Goch) and died. [Group Sheet] [Family Chart]
Family/Spouse: Anne Durward. Anne (daughter of Sir Alan Durward) and died. [Group Sheet] [Family Chart]
Duncan married Joan de Clare in 1284. Joan (daughter of Gilbert the Red de Clare, 3rd Earl of Gloucester and Alice de Lusignan) was born about 1268; died after 1322. [Group Sheet] [Family Chart]
Duncan married Mary de Monthermer in Nov 1307. Mary (daughter of Baron Ralph de Monthermer, Earl of Hertford and Princess Joan of Acre Plantagenet) was born in 1298; died after 1371. [Group Sheet] [Family Chart]