Little is known of the manuscript's early history. According to Hort, it was written in the West, probably in Rome, as suggested by the fact that the chapter division in the Acts of the Apostles common to Sinaiticus and Vaticanus occurs in no other Greek manuscript, but is found in several manuscripts of the Latin Vulgate. Robinson countered this argument, suggesting that this system of chapter divisions was introduced into the Vulgate by Jerome himself, as a result of his studies at Caesarea. According to Kenyon the forms of the letters are Egyptian and they were found in Egyptian papyri of earlier date. Gardthausen Ropes and Jellicoe thought it was written in Egypt. Harris believed that the manuscript came from the library of Pamphilus at Caesarea, Palestine. Streeter, Skeat, and Milne also believed that it was produced in Caesarea.