Yakov Stepanovich Iskra of the Kopacz coat of arms,[1] also known as Ostrzanin or Ostranica (uk.

Яків Остряниця, d. 6 May 1641), was a Cossack hetman and leader of the Ostryanyn uprising.

[1] 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.

[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.