Judah ben Moses ha-Kohen, called in Christian sources Don Yhuda Mosca, Yhuda Mosca el Menor, Yhuda fi de Mose fi de Mosca, and Yhuda el Cohen (or Coheneso) Alfaquin, was one of the foremost translators working in the court of Alfonso X ("the Learned") of Castile (ca. 1243-1272). He was probably born in Toledo, probably into the well-known Ibn Matqa family, and was rabbi of the Toledo synagogue. In addition to Hebrew, he was literate in Arabic, Castilian, and Latin, and was learned in astronomy and astrology, the disciplines in which he worked as a translator under the patronage o…