Iona Campbell, Duchess of Argyll Scottish noblewoman; wife of Ian Campbell, 12th Duke of Argyll (1945–2024) Parents Kathleen Duncan Sir Ivar Colquhoun, 8th Baronet Children Lady Louise Campbell Torquhil Campbell, 13th Duke of Argyll Siblings Torquil Colquhoun Sir Malcolm Colquhoun, 9th Baronet Partners Ian Campbell, 12th Duke of Argyll