The Danevirke defence structures were built in phases from the 3rd century forward and the sheer size of the construction efforts in AD 737 are attributed to the emergence of a Danish king.
Struktur pertahanan Danevirke dibangun dalam beberapa tahap dari abad ke-3 seterusnya, dan ukuran kecil usaha konstruksi itu pada 737 disumbangkan untuk munculnya Raja Denmark.