"For the 19th-20th Century Polish politician, see Krzysztof Mikołaj Radziwiłł
Prince Kristupas Mikalojus Radvila, nicknamed "Perkūnas" (The Thunderbolt) (Lithuanian: Kristupas (Mikalojus) Radvila „Perkūnas“, 1547–1603) was a Reichsfürst of the Holy Roman Empire and a member of the nobility of the Polish–Lithuanian Commonwealth.
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, Great Lithuanian Hetman from 1589, and Starost.
Kristupas Mikalojus Radvila was one of the most talented commanders in the service of Polish–Lithuanian Commonwealth during the wars against Muscovy and Sweden, and won the Battle of Kokenhausen. He received a nickname "the Thunderbolt" (Lithuanian: Perkūnas) for his deadly and very successful cavalry raids against the Ivan the Terrible forces in the Tsardom of Russia territory during the Livonian War and forced it to capitulate. 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." - (en.wikipedia.org 28.12.2020)