Through his mother, Prince Heinrich XXXIII was heir to the throne of the Kingdom of the Netherlands until the birth of the Crown Princess Juliana, daughter of Queen Wilhelmina.Prince Reuss was trained as a doctor, and passed all his medical examinations; he entered the army subsequently and took a commission in the 2nd Dragoon Guards, and afterwards served in the German diplomatic service."[citation needed] Prince Heinrich XXXIII Reuss was seen as the most probable heir to the Dutch throne in the event that Queen Wilhelmina remained childless.Early last year Prince Henry XXXIII was the guest of the Queen at The Hague, and was made much of at the Court and in social circles, so that he came to be generally regarded as "first favourite" in the succession.[citation needed] Allene became the guardian of his young son and brought him to America with her and her new husband, Count Paul de Kotzebue, shortly after their marriage in 1936.