Commercy

The lords of Commercy, a castle on the Meuse in the Barrois, rose from the family of Broyes-Commercy. Around 1247 Simon of Commercy married Mathilde, who inherited Saarbrücken in 1270, and their son Simon IV united both fiefs in 1274 as founder of the House of Saarbrücken-Commercy.

His son John I split the lands in 1326: Saarbrücken and the lower castle went to his grandson John II, while the upper castle passed to a younger son. John II was captured alongside King John at Poitiers in 1356.

When John II died without a son in 1381, his daughter Johanna and her Nassau-Weilburg heirs carried Saarbrücken into the House of Nassau, which held it until the French conquest of 1795. The junior Commercy line survived through the lords of the upper castle; the lower castle was sold to Lorraine in 1444.