Limes Saxoniae

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The Limes Saxoniae (Latin for "Limit of Saxony"), also known as the Limes Saxonicus or Sachsenwall ("Saxon Wall"), was a limes or border between the Saxons and the Slavic Obotrites, established about 810 in present-day Schleswig-Holstein.

After Charlemagne had finally conquered the Saxon lands, he signed the 811 Treaty of Heiligen with the neighbouring Danes and may at the same time have reached a border agreement with the Polabian Slavs in the east. As no major fortifications are preserved, the Limes mainly followed natural obstacles like bogs and thick wood. According to Adam of Bremen's description in the Gesta Hammaburgensis ecclesiae pontificum about 1075, it ran from the Elbe river near Boizenburg northwards along the Bille river to the mouth of the Schwentine at the Kiel Fjord and the Baltic Sea.

The Limes was dissolved during the first phase of the Ostsiedlung, when Count Henry of Badewide campaigned the Wagrian lands in 1138/39 and the Slavic population was germanized by German, mostly Saxon, new settlers.