Prince Frederik, the youngest son of Prince Robert of Luxembourg and Princess Julie of Nassau, has died at the age of 22. He passed away on March 1 from POLG Mitochondrial disease, a rare genetic disorder.

Prince Frederik of Luxembourg, who died at 22, spoke about the rare genetic disorder he navigated in a video released by The PolG Foundation he founded.

Luxembourg’s Prince Frederik has died at the age of 22 after a long battle with a rare genetic condition, his family has said.