Colonel Ivan Sirko is initially a vassal of the Cossack Hetmanate. He is based on a real-life Cossack military leader who lived from 1610 - 1680. He fought alongside Prince Aleksei Trubetskoi, another figure who inspired a character from With Fire & Sword, in a battle against the Crimean Khanate. This article is a . You can help out by expanding it.