The Viking Ring Fortresses: Harald Bluetooth’s Military ArchitectureThe Viking Age is often associated with chaotic, hit-and-run raids, but the Trelleborg-type fortresses (trelleborge) prove that the Vikings were also capable of extreme architectural precision and centralized military planning. Built during the reign of Harald Bluetooth around 980 CE, these circular citadels are among the most impressive archaeological remains in Scandinavia, se…
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