Stones of Mora was the place where the Swedish kings were elected. The origin of the tradition is unknown, but it has been known since the 13th century and mentioned by Snorri Sturlason (died 1241). The first known document tells that Magnus Ladulås was elected at the Stones of Mora in 1275. Magnus IV was elected at the stones on July 8, 1319 and Kristian I in 1457. He was the last to be elected at the stones.
The Stone of Mora and many stones which flanked it with inscriptions commemorating the elections of earlier kings, were probably destroyed in 1515 during the civil war against the Danes. Gustav Vasa and John III are said to have tried to reconstruct the Stones of Mora without success.
One of the fragments is known as the stone Three Crowns since it is the earliest known example of the use of Sweden's national symbol. The fragment is what remains of the election of Albert of Mecklenburg.
The building where the fragments are contained today was constructed by Carl Wijnbladh in 1770.
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.