Mainz is the capital of the state of Rhineland-Palatinate in Germany. It was the capital of the Electorate of Mainz at the time of the Holy Roman Empire. In antiquity Mainz was a Roman fort city which commanded the west bank of the Rhine and formed part of the northernmost frontier of the Roman Empire; it was founded as a military post by the Romans in the late 1st century BC. The city is located on the river Rhine at its confluence with the Main opposite Wiesbaden, in the western part of the Frankfurt Rhine-Main; in the modern age, Frankfurt shares much of its regional importance. The city is famous as the home of the invention of the movable-type printing press, as the first books printed using movable type were manufactured in Mainz by Gutenberg in the early 1450s. Until the twentieth century, Mainz was usually referred to in English as Mayence.