Prince Sébastien Henri Marie Guillaume was born on 16 April 1992 at the Grand Duchess Charlotte Hospital in Luxembourg. He is the fifth child and fourth son of Grand Duke Henri and Grand Duchess Maria Teresa of Luxembourg. He has three older brothers, Prince Guillaume, Prince Félix and Prince Louis, and one older sister, Princess Alexandra.
Prince Sébastien started his primary education at Vauban School (Luxembourg). He is completing his secondary education at St Georges International School in Luxembourg. The Prince mostly enjoys the school subjects arts and sciences. He speaks Luxembourgish, French and English.
The Prince is an avid sports lover. He plays rugby and is part of the National Team of Luxembourg for the -18 year olds. He also enjoys climbing, skiing and swimming.
Based on information from monarchie.lu.