Umm Ma'qil

According to Moshe Gil, "Yusuf" ben Abdallah ibn Salam was named such by Prophet Muhammed (pbuh). Yusuf transmitted his traditions (hadith) in the name of his grandmother named "Umm Ma'qil".

This makes Umm Ma'qil the wife of apostate Exilarch Shallum al-Farsi.

"Jews in Islamic Countries in the Middle Ages", Page 298, Volume 28 of Etudes sur le judaïsme médiéval, by Moshe Gil, David Strassler, Publisher BRILL, 2004, [ ISBN 900413882X, 9789004138827 ]