In 1015, Olav Haraldsson ascended the throne, and as Norway’s king he presumably played a major role in the spread of Christianity in the country. Moreover, he used his position to build up a powerful monarchy. What later ended up as the impressive Nidaros Cathedral was in the beginning just a simple wooden chapel. After Olav Haraldsson was killed at the Battle of Stiklestad in 1030, his body was enshrined in the small chapel. The King was canonised as Saint Olav by the Bishop Grimkjell of Nidaros. Therefore the Cathedral was erected over King Olav’s burial site.