Princess Roza Swiatopelk-Czetwertynski (1914-1990) (1914–1990) Parents Prince Ludwik Swiatopelk-Czetwertynski Princess Roza Radziwill Children Count Victor Plater-Zyberk Count Ludwik Plater-Zyberk Countess Christina Plater-Zyberk Count Christoph Plater-Zyberk Siblings Prince Jerzy Swiatopelk-Czetwertynski Prince Andrew Swiatopelk-Czetwertynski Princess Marie Elizabeth Swiatopelk-Czetwertynski Prince Stanislaw Swiatopelk-Czetwertynski Partners Count Jan Plater-Zyberk