Aggersborg

From Publisher's site

It's the year 980 AD. In northern Europe peace rules - the Viking way. To protect his people from enemy attacks King Harold Bluetooth gives a task to his followers. They are to build a mighty Viking fort. This stronghold is to be surrounded by a circular wall protecting 48 long houses. Two crossing roads are to divide Aggersborg in four districts. The king supervises the construction work. Each time a follower completes a house or a district he will be given the privilege work on the wall.