The Jewish community of Erfurt was founded in the 11th century and became , together with Mainz , Worms and Speyer , one of the most influential in Germany . Their Old Synagogue is still extant and a museum today , as is the mikveh at Gera river near . In 1349 , during the wave of Black Death Jewish persecutions across Europe , the Jews of Erfurt were rounded up , with more than 100 killed and the rest driven from the city . Before the persecution , a wealthy Jewish merchant buried his property in the basement of his house . In 1998 , this treasure was found during construction works . The Erfurt Treasure with various gold and silver objects is shown in the exhibition in the synagogue today . Only a few years after 1349 , the Jews moved back to Erfurt and founded a second community , which was disbanded by the city council in 1458
more than 100 killed
Erfurt massacre (1349)
Erfurt