Mikołaj Radziwiłł, nicknamed The Red (Polish Rudy, Lithuanian: Radvila Rudasis), also known as Mikołaj Radziwiłł the Sixth (1512 – 27 April 1584), was a Polish–Lithuanian nobleman, Count Palatine of Vilnius, Grand Chancellor of Lithuania, and Grand Lithuanian Hetman (from 1576) in the Grand Duchy of Lithuania and later in Polish–Lithuanian Commonwealth. Together with his cousin Mikołaj "the Black" Radziwiłł and the Radziwiłł family were granted title and position as Reichsfürst Prince of the Holy Roman Empire. Mikołaj Radziwiłł spent many years as a military commander. While not the most famous of Commonwealth hetmans, under king Stefan Batory he was fairly successful in defending the eastern borders of the Commonwealth against the Muscovy. One of his most notable victories was achieved during the Battle of Ula of 1564 when his commanded forces defeated much larger Ivan the Terrible's forces.

Mikołaj "the Red" Radziwiłł - Wikipedia