According to legend, the site was where Âu Cơ, wife of King Lạc Long Quân, gave birth to their children,[2] commemorated at the Hùng Temple in modern Phong Châu district, Phú Thọ province.

For this reason, the history of Phú Thọ province is closely linked to that of the country itself.

Its eventual downfall was due to the weakening of the Hùng king, following the rise of foreign powers.

In 258 BC, the Âu Việt tribes under the leadership of Thục Phán sacked Phong Châu during their invasion of Văn Lang.

With the end of the Hùng King Epoch, the seat of government moved to Cổ Loa.