Original: Akershus became a fief in the 16th century, and then also included the current counties of Hedmark, Oppland, Buskerud and Oslo, as well as the municipalities of Askim, Eidsberg and TrÃ gstad in the county of Ã stfold.
Simplified: At that time it included the current counties of Hedmark, Oppland, Buskerud and Oslo. It also included municipalities of Askim, Eidsberg and TrÃ gstad in the county of Ã stfold.