What is the history of the Yiddish language?

The foundations of the Yiddish language can be traced back to the 9th century, when Jewish people began to migrate from Italy to the Rhineland area of Western Germany. These early settlers spoke Old High German, the precursor to Middle High German. As more Jews migrated to the region, their distinct dialect began to take shape, combining features of their native Germanic tongue with Hebrew and Aramaic elements.