The Herzog August Library, in Wolfenbüttel, Lower Saxony, known also as Bibliotheca Augusta, is a library of international importance for its collection from the Middle Ages and early modern Europe. The library is overseen by the Lower Saxony Ministry for Science and Culture.

Codex Guelferbytanus A designated by Pe or 024, ε 33, is a Greek uncial manuscript of the Gospels, dated palaeographically to the 6th century. The manuscript is very lacunose.