Spanish Jews of Ibn Shaprut's period were familiar with the New Testament in Latin. Jacob Ben Reuben in his "Wars of the Lord" translated Gilbert Crispin's "Disputation of Jews and Christians" from Latin into Hebrew, along with quotes from Matthew. Lasker (1998) remarks that "By the fourteenth century, most likely every Iberian anti-Christian Jewish polemicist knew Latin." Moses ha-Kohen de Tordesillas made proficient use of Latin phrases. Profiat Duran (fl.1380-1420) had extensive knowledge of Latin Christian texts, and devoted a chapter of his "Disgrace of the Gentiles" (Klimat ha-goyim) to criticism of Jerome's Latin Vulgate. Hayyim ben Judah ibn Musa argued with Nicholas de Lyra in his "Book of Shield and Spear" (Sefer magen va-romah). Likewise converts to Christianity such as Abner of Burgos (Alphonso of Valladolid, ca. 1270–1347) continued to write polemical, theological, philosophical, and scientific works in Hebrew.