The watchtower is a reference to the Limes Germanicus, built by the Roman Emperor Hadrian (117-138), which once ran along the river Main between Kleinwallstadt and the town across the river, Großwallstadt (klein and groß are German for “little” and “great” respectively).
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In Kleinwallstadt, then also known as Bischofswallstadt, which was converted to Christianity as early as the early 8th century, the Archbishop of Mainz established in 1023 a Vogtei and a tithe court over a great expanse of the Spessart (range).