Astronomer and astrologer from Baghdad who flourished around 760-770, known in Latin by his works such as Omar Tiberiadis astronomi preclarissimi Liber de natiuitatibus & interrogationibus (Venitiis, 1503), of which the original title is Kitâb al-Mawâlid (‘Book of Nativities'). Translated by John of Seville in the first half of the 12th century, this book was so influential that it had at least 16 extant manuscripts and five printed editions from 1503 to 1551. In content, it is a standard treatise on the interpretation of nativities, or birth horoscopes, in three books, quoting Ptolemy, Messahallah and Hermes. It begins by ‘Omar Belnalfargdiani Tiberiadis dixit: Scito quod diffinitiones nativitatum in nutritione sunt quatuor…'
See F.J. Carmody, Arabic Astronomical and Astrological Sciences in Latin Translation. A Critical Bibliography, Berkeley-Los Angeles, 1956, pp. 38-39; F. Sezgin, Geschichte des arabischen Schrifttums, VII, Leiden, 1979, p. 112 (nr. 3), and Omar, De nativitatibus.