Yakiv Ostryanyn

The first references to him relate to his participation in the Polish-Russian war in 1633, where he served as a colonel of the Registered Cossacks.^[2] In 1638 he was elected hetman of the non-registered Cossacks and in the same year initiated an uprising against the Polish–Lithuanian Commonwealth. After losing the Battle of Zhovnyn, he fled to the Russian Empire, where he settled.^[3] In Chuguev, the settlers under the command of Ostryanin participated in the fight against the Tatars, who were raiding the southern borders of the Russian state.^[4] Yakov died on 6 May 1641, killed by Cossacks during a riot caused by conflicts between privates and Cossacks starshyna.^[5]