Many miraculous occurrences are related in connection with his death and his disinterment a year later, after belief in his sanctity had spread widely. His friends, [[Bishop]] Grimkel and Earl Einar Tambeskjelver, laid the corpse in a coffin and set it on the high-[[altar]] in the church of St. Clement in Nidaros (now Trondheim). Olaf has since been held as a [[saint]], not only by the people of Norway, whose [[patron saint]] he is, but also by Rome. Orthodox Christians also venerate him as one of the ancient western saints of the Church before the [[Great Schism]].
In 1075, his incorrupt body was enshrined in what became the cathedral of Nidaros (Trondheim), which replaced the [[chapel]], and became a site of pilgrimage. During the Protestant Reformation his body was removed and reburied. His cultus was aided by the unpopular rule of Swein, Canute's son; Canute's death in 1035 resulted in the flight of many Danes from Norway and the accession of Olaf's son Magnus. Thereafter his cultus spread rapidly. Adam of Bremen (c. 1070) wrote that his feast was celebrated throughout Scandinavia.
His cult spread widely in the Middle Ages, not only in Norway, but also in Denmark, Sweden, and even as far as England; in London, there is on Hart Street a St. Olave's Church, long dedicated to the [[Glorification|glorified]] King of Norway. In 1856 a fine St. Olave's Church was erected in Christiania, the capital of Norway, where a large [[relics|relic]] of St. Olaf (a donation from the Danish Royal Museum) is preserved and venerated. The arms of Norway are a lion with the battle-axe of St. Olaf in the forepaws.