1. Nicholas the Red
(Mikołai Rudy Radziwiłł; Apr 27, 1512 – Apr 27, 1584, Vilnius), high chancellor and high hetman of Lithuania, from 1566 (following his cousin Nicholas the Black [see 2 below]) voivode of Vilnius; he became a Calvinist c. 1564. His descendants remained faithful to the Reformed confession and, until the line failed in 1667, ensured the continuation of Reformed parishes on the Radziwill estates (of the Birse branch) in Lithuania.