Charles-Louis de Biaudos, Count of Castéja (1693-1755) was a French diplomat.
[1] In 1718 he married Jeanne de Paris, with whom he had a son.
No earlier foreign ambassador participated so openly in politics in Sweden as did Casteja.
He constructed a network of Swedish agents to work for French interests, including Margareta Gyllenstierna - who also maintained a political correspondence with the queen of France, Marie Leszczyńska - Charlotta von Liewen and Hedvig Catharina Lillie.
[2] He also unsuccessfully attempted to recruit the king's mistress, Hedvig Taube.