 The beginning of Abner’s doubts about Judaism began with the incident of a false messiah in Avila in 1295. According to Abner, the Jews of the community, which is in North Castile, went outside the city to welcome the messiah, but instead of the messiah they received a rainfall of crosses that stuck to their clothes. Some of the Jews who witnessed the miracle went to Abner for advice. This event instilled in Abner some doubts about the question of the reason for the ongoing exile of Israel and the truth of Judaism. After twenty-two years of feeling ambivalent (i.e., around 1317) Abner wrote about his first revelation in a  dream.[5]  In his dream he saw a man that told him to be “a teacher of righteousness” (mostrador de justicia, not coincidentally the name of Abner’s main book) and to bring his people to freedom from exile. This dream just accents the uncertainty of the Jewish Rabbi. After three more years of studies he had a second dream wherein he had the same revelation, this time noticing that on the clothes the man wore were crosses like the cross of Jesus the Christian. This dream prompted him toward his final conversion around 1320/1321. After his conversion, Abner became the sacristan of the collegiate church of Valladolid and devoted himself to the propagation of Christianity amongst his former fellows Jews (he had come to the conclusion that conversion to Christianity was the only way to be saved from the Exile). We know he wrote an extended polemicist oeuvre and that he took part in the anti-Jewish polemic effort in North Castile around 1336–1339. There was a public disputation between Abner and a rabbi that occurred probably around 1335–1336 on the subject of the prayer of the Jews against the apostates. This dispute was the main reason for the decree against this part of the Jewish prayer (birkatha-minim) by Alfonso XI in 1336. Abner probably died in 1347 or later.