The Château de Pierrefort is a ruined mediaeval castle in the commune of Martincourt. It was built in 1306. In 1300, Pierre de Bar, younger son (among 13 siblings) of Theobald II, Count of Bar, received from his older brother Henri III de Bar among other estates, the lands of Martincourt and Mamey.
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.