Principality of Smolensk
Bryansk remained poorly attested until the 1237-1242 Mongol invasion of Rus'. It was the northernmost of the Severian cities in the possession of the Chernigov Rurikids. After the Mongols murdered Prince Mikhail of Chernigov in 1246 and his capital was destroyed, his son Roman Mikhailovich moved his seat to Bryansk. In 1310, when the Mongols sacked the town again, it belonged to the Principality of Smolensk.