Why did the polish king welcome the Jews?

The Polish king welcomed Jews to his kingdom in the late Middle Ages primarily for economic reasons. Jews were skilled in various trades, finance, and commerce, which contributed to the growth of towns and the economy. Additionally, Poland offered them a degree of religious tolerance compared to other European countries at the time, leading to a significant Jewish population that thrived under Polish rule. This policy not only bolstered the economy but also helped to establish Poland as a center of Jewish culture and scholarship.