This chapter assesses the age of the ‘Court Jew’ (1650–1713), which marked the zenith of Jewish influence in early modern Europe. The remarkable role of the Jews in European affairs at that time rested on the solid foundations laid during the Thirty Years War. By 1650, a scattered but socially closely intertwined élite of provisioners and financiers had emerged who were simultaneously agents of states and the effective leaders of Europe's Jewish communities. Sometimes, they showed a strong sense of commitment to one particular government, but this was, in fact, both unusual and untypical. Generally, Jewish court factors, or Hoffaktoren as they were known in Germany, lived outside the states which they served. Not infrequently, they acted for several governments at once. Most typical of all, the close collaboration and interdependence between them, interlocking with the correspondence between kehillot in different countries, made their activity more thoroughly international and specifically Jewish than the banking and contracting of later times. Assuredly, the system centred on Germany, Austria, and Holland, but it ramified far beyond these limits, exerting an appreciable influence also on affairs in Spain, Portugal, the Spanish Netherlands, Denmark, Poland, Hungary, Italy, England, and Ireland.