The idea that Jews were in league with the devil and could summon him up for their dark purposes was extremely common in the European view of the world.
Legend of the Jew calling the Devil from a Vessel of Blood, woodcarving, 1575, unknown artist in: de Belleforest, François (1530-1583): Histoires prodigieuses extraictes de plusieurs fameux auteurs grecs et latins, sacrez et prophanes , mises en nostre langue par P. Boaistuau, sournommé Launay,... Augmentées... de six histoires advenues de nostre temps, adjoustées par P. de Belle-forest, Paris 1575; source: www.gallica.bnf.fr, permalink: http://gallica.bnf.fr/ark:/12148/bpt6k123271w/f84.image.