Prince Krzysztof Radziwiłł, epithet "Piorun" ("Lightning") (Lithuanian: Kristupas Radvila „Perkūnas“, 1547–1603) was a Reichsfürst of the Holy Roman Empire and a member of the nobility of the Polish–Lithuanian Commonwealth.^[1]

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Quick Facts Born, Died ...

Krzysztof "Piorun" Radziwiłł
Born	1547 Vilnius, Grand Duchy of Lithuania
Died	20 November 1603 Łosośna, Kingdom of Poland
Board member of	Calvinist[clarification needed]
Spouse(s)	Katarzyna Sobek z Sulejówka h. Brochwicz Katarzyna Ostrogska Katarzyna Tęczyńska Elżbieta Ostrogska
Children	with Katarzyna Ostrogska: Janusz Radziwiłł with Katarzyna Tęczyńska: Krzysztof Radziwiłł Halaszka Radziwiłł
Parent(s)	Mikołaj "the Red" Radziwiłł Katarzyna Tomicka-Iwińska

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He was cup-bearer of Lithuania from 1569; Field Hetman of Lithuania from 1572; Castellan of Trakai, Deputy Chancellor of Lithuania from 1579; Voivode of Vilnius Voivodeship from 1584; Lithuanian Grand Hetman from 1589; and Starost.^[1]

Radziwiłł was one of the most talented commanders in the service of the Polish–Lithuanian Commonwealth during the wars against Muscovy and Sweden, and won the Battle of Kokenhausen.^[1] He received the epithet Polish: Piorun / Lithuanian: Perkūnas (translated as "Lightning" or "Thunderbolt") for his deadly and very successful cavalry raids against Ivan the Terrible's forces in Russian Tsardom territory during the Livonian War, forcing it to capitulate.^{[citation needed]}

His achievements, combined with his powerful Radziwiłł family backing, helped him rise to his various voivode and starost offices and further increased his family's wealth.^[1]

Like his father, brother, and nephew, he was an ardent Calvinist and adherent of the Polish Reformed Church, and defended it against the rise of the Counter-Reformation.^[1]