Lisbon's Jewish past in outline
Medieval Lisbon had several Jewish quarters, known as judiarias, the largest of which lay in the lower part of the city, near the area that is today the Baixa. Another quarter existed in Alfama, where the street name Rua da Judiaria still survives. Jewish physicians, financiers, scholars and craftsmen played a significant role in the life of the city and the court.
That position ended abruptly at the close of the fifteenth century. Following the decree of 1496, Jews were given the choice of leaving the kingdom, but in 1497 most were forcibly converted instead, becoming New Christians. In April 1506, a riot that began near the Dominican church of São Domingos turned into a massacre in which a large number of New Christians were killed over several days.
The Baixa was rebuilt after the great earthquake of 1755, and little of the medieval street plan survives there. This is one reason a guided approach helps: much of what is significant is no longer visible and has to be explained in place.