He is also the protector and second in command of the cats, after patriarch Old Deuteronomy; and directs them in the "Awefull Battle of the Pekes and Pollicles".
His name derives from Deuteronomy, the fifth book of the Old Testament of the Bible, which shares the central element of law with the character (who is a magistrate).
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At the end of the show, Deuteronomy is kidnapped by Macavity and restored by Mr. Mistoffelees.