Prince Frederik, the youngest son of Prince Robert of Luxembourg and Princess Julie of Nassau, has died. He was 22. Frederik died from a rare genetic condition called POLG Mitochondrial disease, his dad announced in a statement shared on the POLG Foundation website.

Prince Frederik of Luxembourg had suffered from a rare disorder known as POLG Mitochondrial disease since the age of 14 and passed away from it earlier his month

The young royal, who was born with POLG Mitochondrial disease, died on March 1 Prince Frederik, the youngest son of Prince Robert of Luxembourg and Princess Julie of Nassau, has died. He was 22. Frederik died on March 1 from the rare genetic condition POLG Mitochondrial disease,