Helena Radziwiłł 1500 - 1546 (1507–1546) Parents Mikołaj II Radziwiłł Elżbieta Sakowicz Children Prince Yury Yurievich of Slutsk Simeon III Olelkovich Sophia Olelkovich Siblings Jan Radziwiłł Elźbieta Holszanska (née Radziwiłł) Sofia Radziwiłł Mikołaj III Radziwiłł Partners Prince Yury Siamionavich of Slutsk
