VietNamNet Bridge – Co Loa Citadel was built near Phong Khe, about 20 km to the north of today’s Hanoi, during the end of the Hong Bang Dynasty (about 257 BCE). The fortress is a spiral-shaped complex of the then new capital. The site was the source of various relics of the Dong Son culture of the Bronze Age.
According to folklore, An Duong Vuong defeated the last of the Hung Kings in 257 BCE and founded the kingdom of Au Lac, choosing the site of Co Loa as his capital.
Co Loa is a very large site and is the dominant presence in the northern floodplain of the Red River Delta, which would have required a large amount of labor and resources to have built in its time.
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