Obadiah the Proselyte
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Obadiah the Proselyte (born Johannes son of Dreux around 1070) was a Catholic priest who converted to Judaism. It was common practice for proselytes to choose the name "Obadiah" because of the tradition that Obadiah the prophet was an Edomite converted to Judaism.
The details of why he converted are not entirely clear.[1] It is believed he had been inspired by the Jewish people during the First Crusade and archbishop Andreas of Bari who had converted to Judaism. His understanding of the Bible may have also played a role.[2]
He is known for recording medieval Jewish chant in Gregorian notation.