Rosenburg Castle was built in the 12th century by the Counts of Riedenburg. It has been rebuilt and extended many times, right up to the present day.
In the Peasants' War , the castle was conquered in April 1525 by rebels and largely destroyed. A reconstruction took place between 1556 and 1560. In the Thirty Years' War the castle 1632-1634 was sacked several times. During the War of Spanish Succession Rosenburg was conquered by the Austrians.
The well maintained property now serves as a castle museum.
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.