The North Sea Flood of St. Marcellus in 1362 was a catastrophic storm surge that inundated the historic trading port of Rungholt, leading to the loss of tens of thousands of lives in northern Europe. This disaster highlighted the vulnerability of coastal communities to natural disasters and prompted changes in flood management and land use. The flood's impact on trade and settlement patterns had lasting effects on the region's economy and geography.

The North Sea Flood of St. Marcellus in 1362 led to the haunting legend of Rungholt, which became a frequent subject in Germanic folk ballads. These narratives explored themes of pride and subversion by the sea, reflecting the cultural memory of loss and the fragility of human endeavors.