Donald III, also known as Donald of the Isles, was a Scottish nobleman who lived during the late 12th century. He was a member of the House of Dunkeld and served as a claimant to the Scottish throne. His lineage connected him to the royal family, which played a significant role in the political landscape of medieval Scotland. His reign was marked by conflicts with other claimants and the English crown. Donald III's rule was relatively short-lived, and he faced challenges in maintaining power. Ultimately, he was defeated and replaced by King Alexander I, which led to a shift in the dynamics of Scottish leadership during that era.