The oldest record of Ophemert Castle dates from 1265, when it was owned by Rudolf de Cocq. The castle belonged to De Cocq (later Haeften) family until 1844. The current building dates mainly fromt he 17th century, when it was rebuilt after the attack of French Army. Today it is privately owned by the Mackay family.
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.