Earl of Ruglen
Along with the subsidiary titles Viscount of Riccartoun and Lord Hillhouse , it was created on the 14th of April , 1697 , for Lord John Douglas-Hamilton , fourth ( third surviving ) son of William Douglas-Hamilton , Duke of Hamilton , 1st Earl of Selkirk , and his wife Anne Hamilton , 3rd Duchess of Hamilton . 
<triplet> William Douglas-Hamilton, Duke of Hamilton <subj> Anne Hamilton, 3rd Duchess of Hamilton <obj> spouse <triplet> Anne Hamilton, 3rd Duchess of Hamilton <subj> William Douglas-Hamilton, Duke of Hamilton <obj> spouse