Old Aker Church
Old Aker Church was built as a three-naved Romanesque style basilica and constructed from limestone. It is believed to have been erected by King Olav Kyrre in 1080 as a church for all of Vingulmark, the historic area surrounding Oslo. The grounds of Old Aker Church were originally likely the former site of the regional thing during the pre-Christian period.
Oslo Cathedral
The current Oslo Cathedral is the third cathedral in Oslo, Norway. The first, Hallvards Cathedral, was built by King Sigurd I of Norway in the first half of the 12th century, and was located by the Old Bishop's Palace in Oslo, some east of today's cathedral.