Ptolemy's treatise on astrology, the Tetrabiblos, was the most popular astrological work of antiquity and also enjoyed great influence in the Islamic world and the medieval Latin West. The Tetrabiblos is an extensive and continually reprinted treatise on the ancient principles of astrology in four books (Greek tetra means "four", biblos is "book"). That it did not quite attain the unrivalled status of the Syntaxis was perhaps because it did not cover some popular areas of the subject, particularly horary as ...

See also:

Ptolemy, Ptolemy - Astronomy, Ptolemy - Geographia, Ptolemy - Ptolemy and astrology, Ptolemy - Ptolemy and music, Ptolemy - Named after Ptolemy

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