According to the <<http://tunearch.org/wiki/Annotation:Miss_Katherine_Stewart_Forbes|Traditional Tune Archive>>:

> Moyra Cowie (*The Life and Times of William Marshall*, 1999), thinks Miss Katherine was a relation
> of Sir William Forbes of Pitsligo Castle, a grandson of the 4th Laird who forfeited his entire holdings
> after Culloden, and who was sustained for a time on the kindness of his tenantry and friends, while
> he lived in caves disguised as a beggar. Sir William was a banker who was able to purchase the
> forfeited estate of Achmeddan.