Thun is an ancient city, from before Christ. The name is from the Celtic term Dunum, meaning “fortified city”. It fell to Rome in 58 BC, and was one of the main centres of Roman administration. Thun became a part of the Holy Roman Empire in 1033. In 1195 Duke Bertold von Zähringen, built a castle in Thun and expanded the city. Today it houses a museum of Swiss history.
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