Tula had been a minor fortress at …
Years: 1521 - 1521
Tula had been a minor fortress at the border of the Principality of Ryazan in the Middle Age.
As soon as it passed to the Grand Duchy of Moscow, a brick citadel, or kremlin, had been constructed in 1514–1521.
The Crimean Tatars renew their attacks on Tula in 1521.
