Background
He was born in Teplitz (now Teplice) on 14 October 1848 into a prominent Bohemian noble family, the son of Prince Edmund Moritz and Princess Elisabeth-Alexandrine von Clary-und-Aldringen, (née Countess de Ficquelmont).
He was born in Teplitz (now Teplice) on 14 October 1848 into a prominent Bohemian noble family, the son of Prince Edmund Moritz and Princess Elisabeth-Alexandrine von Clary-und-Aldringen, (née Countess de Ficquelmont).
The couple had three children. In 1897, he was appointed Austro-Hungarian Minister at Stuttgart succeeding the future Imperial Foreign Minister Burián von Rajecz and then from 1899 at Dresden, two of the three missions that Austria-Hungary had in Germany other than Berlin (the third one was in Munich). Although mostly maintained due to the claims of tradition, these missions were popular postings due to personal comfort and convenience and particularly the post in Dresden was generally awarded to someone enjoying the special favour of Emperor Franz Joseph I.
In December 1902, Count von Clary-Aldringen was appointed to serve as Minister at Brussels and would remain there for eleven years until 1914.
Acting as the doyen of the diplomatic corps in Brussels and personally popular, it fell upon him to deliver the declaration of war on 28 August.
When leaving Brussels, he handed over the legation to the United States minister in Belgium Brand Whitlock. He played no further role during the war.
In March 1920, he became the sixth Prince von Clary-Aldringen following his older brother"s death and died in Teplitz on 11 February 1929.