St. Olof's Church was originally built around the year 1100 and it consisted of a main tower, chancel and nave. It was later extended, but the construction was probably interrupted when archbishop’s seat was moved to Gamla Uppsala in the 12th century.
St. Olof's church has been influenced by the Nidaros Cathedral in Norway, while the small tapering windows have an Anglo-Saxon style. The church is dedicated to the Norwegian viking Olaf Tryggvasson, king between 995-1000.
It is not certain by whom the church was built. Most probably it was authored by the Benedictines or local trade guild. Archaelogical excavations have revealed remains under the church, which are thought to have belonged to an even older stone church. It may have been one of the first built in Sweden.
References:House of the Blackheads (Melngalvju nams) is a building situated in the old town of Riga. The original building was erected during the first third of the 14th century for the Brotherhood of Blackheads, a guild for unmarried German merchants in Riga. Major works were done in the years 1580 and 1886, adding most of the ornaments.
The structure was bombed to a ruin by the Germans June 28, 1941 and the remains demolished by the Soviets in 1948. The current reconstruction was erected from 1995 to 1999. Today the House of Blackheads serves as a museum and sometimes concert hall.