Petosiris to Nechepso is a letter describing an ancient divination technique using numerology and a diagram. It is likely to be a pseudepigraph. Petosiris and Nechepso are considered to be the founders of astrology in some traditions. One translation of this letter into Latin is attributed to Saint Bede, and can be found in Cotton Tiberius.The technique is known by several names, including the Petosiris Circle,the Sphere of Apuleius, Columcille's Circle, and Democritus's Sphere. The attribution of ancient authors is a typical practice of Neoplatonism and Gnosticism, and the technique may arise from this tradition. Examples of the figure are known from Anglo-Saxon manuscripts.