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I removed the speedy a quick search found supporting references
"In eastern Belorussia the principality of Mstislavl played a political role of considerable importance because of its location in the border area between Lithuania and Muscovy ."
Similarly to articles like the Principality of Smolensk, we could potentially also create a page dedicated to the role of Prince of Mstislavl, who was the Kniaz of the principality. — Preceding unsigned comment added by Nikolai Gennadievich Nazarov (talk • contribs) 14:46, 13 May 2022 (UTC)[reply]
Principality of Mstislavl was a prominent Russian principality among others in the region which have their own fully fleshed pages. Nikolai Gennadievich Nazarov (talk) 18:51, 23 October 2022 (UTC)[reply]