Jewish pope Andreas is a legend about a Jewish pope of uncertain accuracy. The 1906 Jewish Encyclopedia writes. "According to an old Spanish document discovered among some penitential liturgies by Eliezer ben Solomon Ashkenazi, the editor of "Ṭa'am Zeḳenim" (Frankfurt am Main, 1854), Andreas was a Jew who, upon becoming a Christian, distinguished himself so markedly as to become successively cardinal and then pope.
During his pontificate, it is alleged, a calumny was lodged against the Jews, as the result of which an outbreak of the persecutions of the Jews was imminent. At the critical moment, however, the pope appeared on the scene and, by delivering a speech in favor of the Jews, succeeded in subduing the popular passion. The Jews sent a delegation of their most prominent and taught men to bear to the pontiff the expression of their gratitude. In response, the pope handed to the delegates a Selichot, or penitential prayer, which he had composed in the sacred tongue, and which he now requested them to spread broadcast among all Jewish communities, and to have incorporated in their books of prayer. This they did. The prayer bore the pope's signature "Andreas," though in print one letter was inverted."
The legend is sometimes associated with Antipope Anacletus II or with Pope Alexander III, who apparently was well-disposed toward Jews.
The legend has been varied from source to source until it was accepted in its final form.
According to a traditional account, El-hanan, or Elhanan, a Jewish boy, the son of Rabbi Simeon ha-Gadol ("Simeon the Great" in English; c. 950), is stolen on during a Jewish Sabbath by a Christian maidservant at night while he is asleep in his bed. When he wakes up in an unfamiliar room, he is told his parents are dead. He is held prisoner in a monastery where he receives an ecclesiastical education and rises rapidly in hierarchic circles, until he becomes pope.