The Michael I. Rostovtzeff Papers span the years 1897 to 1968 with the bulk dated 1926 to 1954. The collection chiefly consists of the correspondence of Michael Rostovtzeff and C. Bradford Welles, a colleague of Rostovtzeff's at Yale University, with other scholars in the fields of ancient history, archaeology, and philology. Other materials include autobiographical writings by Rostovtzeff, photographs, financial papers, and clippings. The papers primarily reflect Michael Rostovtzeff's tenure as a faculty member of the Classics Department at Yale University.