The city was originally a Celtic village, and under the Romans it became a garrison town called Argentoratum. It was captured in the 5th century by the Franks, who called it Strateburgum, from which the present name is derived. In 842 Charles II (the Bald), king of the West Franks, and Louis II (the German), king of the East Franks, took an oath of alliance there, the Serment de Strasbourg, a text of which is the oldest written document in Old French. After a struggle for power between its citizens and the bishops in the Middle Ages, Strasbourg became a free city within the Holy Roman Empire.
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