Scholar and Hebrew grammarian. A physician by profession, he practiced medicine first in Cordova, Spain. When the Berbers destroyed Cordova, he settled in Saragossa.

Ibn Jannah’s primary interest, however, was the study of Hebrew grammar. He wrote two important books, classics of their kind, one on grammatical construction and the other on sources of the Hebrew language. These books were translated from the Arabic into Hebrew by Judah Ibn Tibbon.