The Electorate of Mainz was a significant ecclesiastical principality in the Holy Roman Empire, established in the early Middle Ages. It was ruled by the Archbishop of Mainz, who held both religious and political power. The electorate played a crucial role in the election of the Holy Roman Emperor, as one of the seven prince-electors. Located in present-day Germany, the electorate encompassed the city of Mainz and surrounding territories along the Rhine River. The region was known for its cultural and economic importance, particularly during the Renaissance, when it became a center for printing and publishing, notably with the work of Johannes Gutenberg.