Yehuda ben Moshe ha-Kohen lived during the 13th century and became the personal physician of King Alfonso X of Castile.
He also excelled as an astronomer and was a prominent translator and writer at the Toledo School of Translators where he translated important scientific works from Arabic and Hebrew into Castilian.
He was the Rabbi of the Synagogue of Toledo, and one of the most influential personalities of the Jewish community in the city at that time.