In September 1986, as construction was beginning at Grosse Kirchenstrasse 5-13, massive stone blocks came into view and were only saved from being carted off to the dump by the quick action of the Kastel Local History Society – no one imagined that this represented one of the most important finds in the field of Roman archeology: the discovery of the most significant Roman structure of its kind north of the Alps, the Germanicus Arch.  
This Roman triumphal arch lay precisely on an axis leading from the Roman encampment (in today’s Kästrich district) in Mainz over the Roman bridge and continuing in a straight line in the direction of Hofheim. The "Castellum Mattiacorum," the bridgehead fortress of the Flavian Period enclosed within a defensive stone fortification, lay between the triumphal arch and the Rhine. On the landward side of the arch there was a crossroad with two stone markers giving the distance to “Aquae Mattiacae” (Wiesbaden) and further north a water conduit. Just a little to the southeast lay a large thermal bath complex dating from the 2nd century A.D.
A wooden bridge spanning the Rhine provided access to the bridgehead as well as the Germanicus triumphal arch on the right bank. The latter communicated to the Germanic tribes both the Roman claim to power and the boundary of the “Imperium Romanum.”

Opening hours

Sun 10:30 hrs. to 12:30 hrs.
Guided tours are possible
by arrangement any time.
Admission: free of charge

Bus & Railway

Kastel / Railway Station
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