Co Loa Festival in Dong Anh
Co Loa Festival takes place on the sixth day of the first lunar month at the Co Loa citadel site in Dong Anh, Hanoi, commemorating King An Duong Vuong, founder of the ancient Au Lac kingdom and builder of Vietnam's oldest citadel, whose earthen ramparts still stand on the festival grounds today.
Roughly six kilometers from central Hanoi, the earthen ramparts of Co Loa still trace the outline of what is considered Vietnam's oldest citadel, built more than two thousand years ago by King An Duong Vuong, founder of the Au Lac kingdom.