(~A.D. 600)
A prominent manuscript that was used by scholars in the Masoretic period. It has not survived but was said to be very accurate and was used for the revision of other manuscripts. Readings are cited repeatedly by the early medieval Masoretes.
It is traditionally attributed to Rabbi Hillel ben Moses ben Hillel.
(The Origin of the Bible: Newly Updated by F. F. Bruce, J. I. Packer, Philip W. Comfort, and Carl F. H. Henry, 2020. Texts and Manuscripts of the Old Testament by Mark R. Norton, Page 159)