Where Yaish lived, in Lisbon, was a large nucleus of Jews, with synagogues and infrastructure to support Jewish life.
Dom Afonso I appointed Yaish, who was Jewish, as steward and knight-mor (of the Order of Saint James of the Sword), was rewarded for services rendered in the fight against the Moors, and granted the Village of Blacks.
In the Register of Population of the Kingdom, made by King João III of Portugal, in 1527, the Village of Blacks had about 90 inhabitants).After claiming his land, Yaish Flourished and died about 1150.
In honor of his reward, and in reference to the Moors Yaish and his descents bore the additional cognomen, "Negro".
Óbidos was taken in 1148, by the Jewish vizier, Yaish ibn Yahya; in return for its liberation King Afonso Henriques I rewarded Yaish ibn Yahya with a nearby town and anointed him "Lord of Unhos, Frielas and Aldeia dos Negros".