It was constructed about 90 CE and enlarged until about 210. Then the Romans left it after 260. It is estimated that it was home to a cohors equitata, about 500 cavalry and infantry, to protect the access to the Rhine-Main valley from the Germanic tribes in the North. Eventually it decayed, and its stones were used as a quarry.
In 1897 Wilhelm II ordered that it was rebuilt. Today the Saalburg houses a museum and is a center for Roman archeology. It is located between Bad Homburg and Wehrheim, some 30 km north of Frankfurt am Main.
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