Beginning in late Roman times, the city of Mainz (then
Mogontiacum) was defended by a wall with watchtowers and city gates. The first wall was built shortly before the destruction of the
limes in 259/260 CE. Not long after 350, in the course of the abandonment of the Roman
camp, this wall was lowered and rubble (
spolia) from earlier construction used to enlarge and strengthen it. After the Romans withdrew, it was improved at various times, particularly in the
Merovingian and
Carolingian periods, becoming what archaeologists studying the city have called the "Roman-Carolingian" wall. However, in 1160 the continuity of the city's defences was drastically interrupted. There was a longstanding dispute between the citizens of Mainz and their
archbishop,
Arnold of Selenhofen (and also with the
Holy Roman Emperor Frederick Barbarossa); after the archbishop was murdered, the emperor imposed an
imperial ban on the city. The city walls and towers were razed (although it is possible that on the inland side the destruction was only partial). However, Mainz was an important political and strategic ally in the
Hohenstaufens' struggle for supremacy in the German Empire against the
Welfs, and so in –1200 the city was granted permission to rebuild the defences. The predecessor of the Wood Tower, the so-called
Neuturm (New Tower) was built in the second half of the 13th century when the previously independent settlement of Selenhofen was incorporated into the defences of the city. It replaced the
Romanesque Wingert Gate; the first recorded mention of it is in 1366. ==Architectural style==