St. Mary's Church, Oslo

St. Mary's Church in Oslo, Norway, was a significant medieval stone church with architectural features from various phases of construction, including a Gothic choir added in the 13th century and large towers in the 14th century. Serving as the royal chapel, it played a crucial political role, with the church's provost serving as Chancellor of Norway from 1314. The church was severely damaged by fire during the Swedish war of independence in the early 16th century and was subsequently demolished following the Protestant Reformation in 1542. Archaeological excavations have uncovered traces of an older wooden structure dating back to around 1050 CE, and the remains of King Haakon V and Queen Euphemia were found and reburied in Akershus Castle’s Royal Mausoleum, highlighting the church's historical and archaeological significance.