Isabella MacDuff, Countess of Buchan Scottish noblewoman, figure in the Wars of Scottish Independence (1201–1313) Parents Colbán, Earl of Fife Anna Durward Donnchadh III, Earl of Fife Joan de Clare Children Siblings Donnchadh III, Earl of Fife Marjory of Fife William Ferrers, 1st Lord Ferrers Partners John Comyn, Earl of Buchan