Thaddeus Potter, 17th Duke of Inverness (1845 - 1924) was a pure-blood wizard and a member of the noble branch of the Potter family. He was the son of Valerius Potter and his wife Helvia. He would later marry Constance Fleamont, and would have two children with her, Henry and Alfred. At the later years of his life, Thaddeus would slip into insanity, one of the most famous episodes of his condition having been his "escape" from Inverness Castle, whilst completely naked. After his death, Henry became the new Duke of Inverness.