Ulugh-Beg or Ulug-Beg [key], 1394–1449, Timurid ruler and astronomer. The grandson of Timur (or Tamerlane), he succeeded to the Timurid domain in 1447. A patron of the arts and sciences, he established an astronomical observatory at Samarkand and compiled a star catalog (1420–37). His work, written in Arabic, was translated into Persian. It became known in Europe in the 16th cent. and a Latin version appeared in England (1665). A small museum of astronomy now stands on the remains of his observatory.
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