de Sousa, Antonio Caetano (1735). Historia genealogica da casa real portugueza [Genealogical History of the Royal House of Portugal] (in Portuguese). Vol. 2. Lisboa Occidental. p. 497.
hebrewbooks.org
A historical record of great importance is found in Solomon ibn Verga's book, Shevat Yehudah, Lvov 1846 (p. 76 in PDF), where the author mentions in the name of Rabbi Shem Tov, the son of Shem Tov Sukkam, that in the year 5150 anno mundi (a year corresponding with 1390 of our Common Era), during the reign of King Henry III (Don Enrico), while he was still a youth, many of the local Spaniards had risen-up to force the nation of Israel in Spain to abandon their fathers' religion and to embrace Christianity, and that the people oppressed the Jews and beat them with severe beatings. Subsequently, many Jews in Spain abandoned their religion, especially (using his own words) "the great Jewish congregation at Seville, most of whom choosing to become Christians" instead of enduring their afflictions. Likewise, the Jewish communities in Córdoba and in Usún (a place in Navarra) gave-in to pressure and many converted, as did all of the region of Andalucía, besides many other great cities, such as Ocaña (in Andalucía), Escalona (in Castille) and Torrijas (in Aragon), among other places expressly mentioned by name. He adds that their sufferings were so great that it is not fitting to make mention of them because of their bringing utter "terror to the hearts" of those who should hear them.
