The fortress was built in NUMBER@1 , and the meaning of the name is `` the -LRB- fortified -RRB- house of -LRB- the district -RRB- Aker '' .

The fortress was built in NUMBER@1 . Its name means `` the -LRB- fortified -RRB- house of -LRB- the district -RRB- Aker '' .
