Archduchess Marie Caroline Ferdinanda of Austria, Crown Princess of Saxony (8 April 1801, Vienna, Austria – 22 May 1832, Pillnitz, Germany).
He was present with the Count of Artois, the reactionary brother of Louis XVI, at Pillnitz in August 1791 at the time of the issuance of the Declaration of Pillnitz, an attempt to intimidate the revolutionary government of France that the Count of Artois pressed for.
Gustav, Prince Vasa (9 November 1799 at Stockholm – 4 August/5 August 1877 at Pillnitz), born Crown Prince of Sweden and later called Gustaf Gustafsson von Holstein-Gottorp, Prince of Vasa) was the son of King Gustav IV Adolf of Sweden and Queen Frederica.
(The Pillnitz Conference itself dealt mainly with the Polish Question and the war of Austria against the Ottoman Empire.)
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Declaration of Pillnitz was a statement issued on 27 August 1791 at Pillnitz Castle near Dresden (Saxony) by the Habsburg Holy Roman Emperor Leopold II and Frederick William II of Prussia.
Pillnitz Castle was the summer residence of many electors and kings of Saxony; it is also known for the Declaration of Pillnitz in 1791.
# An agreement was made at Pillnitz, on 24 July, between Leopold of Austria and Frederick William of Brandenburg, who pledged themselves to restore to France the throne of the absolute monarchy; and you were silent on that agreement up to the time when it was known to all Europe.