This city on the southern shore of Lake Mälaren made its mark on Sweden's history. It was one of the strongholds of Lutheranism after the young deacon Olaus Petri won over the archdeacon of the city to the cause of the Reformation. He was Laurentius Andreae, who had the honour of proclaiming Gustav Vasa King of Sweden on 6 June 1523. Gyllenhjelmsgatan, a street lined with low timber houses, was mapped out by royal decree around 1640 to create access to the cathedral. To the west, the maze of medieval streets has been preserved. As for Lillgatan, this street is notable for its 17C and 18C red-painted houses.