To celebrate the 90th anniversary of HRH Grand-Duke Jean , Luxembourg Post has issued the stamp set on March 15, 2011. The issue comprises of two stamps depicted His photo and His youngest son, Prince Guillaume.
Grand Duke Jean has served His country as Chief of State for 36 years and can, on the occasion of His 90th birthday, reflect on a full career, rich in emotions and memories. Born on 5 January 1921 at Berg Castle and given the name Guillaume Robert Antoine Louis Marie Adolphe Marc d’Aviano of Luxembourg, He is the eldest son of the Grand Duchess Charlotte of Luxembourg and Prince Felix of Bourbon Parma. After finishing His primary and secondary studies in Luxembourg, He completed His studies at Ampleforth College in Yorkshire County in England.