What happened to Sparta?
After ancient Sparta's power was broken by the Thebans and later the Romans, the city dwindled into a small village and was eventually sacked by the Visigoths at the end of the fourth century. During the Middle Ages, the site was largely abandoned as the population moved to the nearby fortified hilltop of Mystras for better protection. In 1834, after the Greek War of Independence, King Otto of Greece refounded the modern city of Sparti directly atop the ancient ruins, creating the grid-patterned town that exists today.
Modern constructed has obscured some of the ancient ruins, but something else happened, far more terrible.
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To see learn one “modern” archaeologist did here, watch the video.