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Lord Cassius Sencen is the husband of Lady Gisela Sencen and the father of Keefe Sencen. Once believed to be a member of the Neverseen, Lord Cassius has had a rocky relationship with his son, which he tries to fix in books 5-7. Lord Cassius also wants to become a member of the Black Swan, but his requests have been denied by his son and many other members. Later on, in book 6, he trades a piece of information for entrance to the Black Swan.