William, Duke of Brunswick
William was the second son of Frederick William , Duke of Brunswick-Lüneburg , and after the death of his father in 1815 , was under the guardianship of King George IV of the United Kingdom . 
<triplet> Frederick William, Duke of Brunswick-Lüneburg <subj> William, Duke of Brunswick <obj> child <triplet> William, Duke of Brunswick <subj> Frederick William, Duke of Brunswick-Lüneburg <obj> father