Đại Việt sử ký toàn thư
The historical site was the third capital of Văn Lang, following the previous capital Nghĩa Lĩnh. Its ruins are located near Bạch Hạc District, Việt Trì, Phú Thọ Province, and also the name of Phong Châu district, Phú Thọ province. The 15th century book "Đại Việt sử ký toàn thư" (Đại Việt Complete History) gave more information about Phong Châu.