[4] On 2 December 1799, Goya wrote to the prime minister to thank him for having been granted permission to fish in the Casa de Campo, the King's private hunting estate.The letter continues as follows: The diamond jeweler Soto came and left me a medallion in which the portraits of Their Majesties are to be inserted.
I cannot think who could copy them in miniature, except for Ducker, who is currently in prison, because it happened with a protrait of mine of the duke of Aba [sic; Alba that no one knew how to copy but for said Ducker, nor do I believe that for this task someone could be found in Italy or France: Your Excellency could permit him to leave prison, even if he returns at night, and you will have excellent portraits of the Monarchs.
[4]Urquijo noted in the margin of the letter that although Ducker was to be released from prison to work for the Royal Family, "he will be expelled from this kingdom unless he uses the necessary moderation in his language and manners".
[5] The Fundación Lázaro Galdiano in Madrid has a miniature Portrait of Josefa Tudó Cathalán Alemani, condesa de Castillofiel, attributed to Ducker, painted around 1805.
[6] The descendants of José Pascual de Zayas y Chacón also have in their possession a miniature of the general painted in 1814.