During the excavations of the
four Viking ring- forts in Denmark remnants of building foundations were
Erik Reitzel has studied the sites and has concluded that, probably, the roof
structures of these buildings were structures of tents. The conclusion accords
with the fact that nothing is left of solid elements of roof constructions.
theory is sustained by written sources, particularly the Islandic sagas and the
writings of Abbon, a monk who witnessed the siege of Paris by the Vikings in
hypothesis has been supported by a reconstruction.