Map description: Carolingian Empire & Limes Sorabicus.
Serbian limes (Latin: Limes Sorabicus) was a frontier district on the eastern border of East Francia in the 9th through 11th centuries.
It was composed of several counties bordering the Serbs (Upper Sorbian: Serbja; Lower Sorbian: Serby; also known as Wends, Lusatian Serbs or Lusatian Sorbs).
Because of the Serbs (Sorbs), Charles the Great (742-814), King of the Franks (reigned: 768-814), and Emperor of the Holy Roman Empire (reigned: 800-814) had to build between 805 and 808 the huge line of defense called Serbian limes from Baltic Sea to Karantania (now Austria, Slovenia, Croatia and Hungary), the line is intersected territory of modern Germany in the west part who inhabited the Germans (Franks and Saxons) and the eastern part of the locations where Serbian tribes were located.
Border line (towards Serbs), from Istria (Jacek Kowalski - „Wielka encyklopedia staropolska“, Dębogóra: Wydawnictwo Dębogóra, 2012), through Erlangen along the Saale river valley... up to Lübeck in Baltic Sea (German: Ostsee).
On the map you see (see legend on the map) Limes Sorabicus indicated with full red line.
Name of work (book): „Prahistoria ziem polskich: Slowianśzczyzna pierwotna. Początki polskiej Kultury i organizacji“
Map Name: Słowiańszczyzna zachodnia i Germania
Author: Pole, Włodzimierz Dzwonkowski (1880-1954), historian
Publisher: E. Wende i SKA
Place of printing: Warsaw (Królestwo Polskie/Królestwo Kongresowe: 1815-1918 – Россійская Имперія/Российская империя: 1721-1917)
Year of edition: 1918
Languages: Polish
Alphabet: Latin script