Moses Herzog is a fictional character created by author Saul Bellow in his novel titled "Herzog," published in 1964. The story follows Herzog, a middle-aged Jewish intellectual living in Chicago, who grapples with personal crises, including failed relationships and existential questions. Throughout the novel, Herzog writes letters to various people, expressing his thoughts and feelings, which reveal his inner turmoil and search for meaning. The narrative explores themes of identity, love, and the complexities of modern life, making it a significant work in American literature.