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Books about Fayyumi:
The Bustan Al-Ukul by Nathanael Ibn Al-Fayyumi by David Levine (May 1, 2009)
The Bustan al-ukul. by Nathanael ibn al-Fayyumi; ed. and tr. fro by Nathanael ben Fayyumi. 12th cent. (1908)
Wiki information Fayyumi:
Natan'el al-Fayyumi, born about 1090 - died about 1165, of Yemen was the twelfth-century author of Bustan al-Uqul, a Jewish version of Ismaili Shi'i doctrines. Like the Ismailis, Natan'el argued that God sent different prophets to the various nations...
Jacob ben Nathanael ibn al-Fayyumi was a rosh yeshiva of the Yemenite Jews in the second half of the 12th century CE. All that is known of him is that at the suggestion of Solomon ha-Kohen, a pupil of Maimonides, he wrote to the latter asking his...