While pure blood (so-called limpieza de sangre) would come to be placed at a premium, particularly among the nobility, in a 15th-century defense of conversos, Bishop Lope de Barrientos would list what Roth calls "a veritable 'Who's Who' of Spanish nobility" as having converso members or being of converso descent.
Many Conversos, (Marranos and Moriscos) and Sephardi Jews fled to the Ottoman provinces, settling at first in Constantinople, Salonika, Sarajevo, Sofia and Anatolia.
Of converso origin, Fernández de Palencia was educated at the palace of the bishop of Burgos, Paul of Burgos, a former rabbi who had been converted to Christianity by Saint Vincent Ferrer.