Sahaidachnyi

Hetman Petro (Peter) Konashevych Sahaidachnyi (c.1570-1622) was a Cossack leader in what is now the Ukraine who unified the Cossacks (Kozaks) into a regular military formation and moved their capital to the city of Kiev where he encouraged a cultural and spiritual revival. His army defeated the Turks on several occasions. After his death the Polish government did not need the help of the Cossacks and reduced their rights.

The Polish-Lithuanian king, John III Sobieski, later described Sahaidachnyi as "a man of great spirit who sought danger, did not care about his own life, was swift and energetic in battle, cautious, slept little and was sober... was careful at discussions, and non-talkative in conversations."

from the biographical dictionary, Saints, Sufis and Yogis, available through lulu.com