Bladenhorst castle was first mentioed in 1266 as the residence of the lords of Blarnhurst lived there. At the beginning of the 14th century it became the possession of the family of Düngelen. In 1338, Rötger Düngelen made the castle available to the Duchy of Cleves to use in the event of war. Through marriage, in 1496 the castle passed to Philip of Viermünden. From 1624 to 1881 it was inherited by the Westphalian noble family of von Romberg.
The structure originally consisted of four wings. The gatehouse is the oldest part of the building, the chapel dates from 1332. The castle as it stands is in the style of the Renaissance - coming from its rebuilding between 1530 and 1584.
Today castle is still inhabited, and privately owned, consequently there are no public tours or visits, some parts of the castle are rented out to private individuals.
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.