Dee ihe na-aga n'ihu na paragraf a - Onye a na-eme ka ọ bụrụ onye na-eme ihe ọjọọ maka ndị eze nke 1814, a chụpụrụ Blacas n'ihu ọha dị ka onye nnọchi anya France na ụlọ ikpe nke Alaeze nke Sicily abụọ, nke isi obodo ya dị na Naples. N'ebe ahụ, ọ kwadoro alụmdi na nwunye nke 1816 nke nwa nwanne Louis nke XVIII, Duke nke Berry, na nwa nwanyị Francis nke Mbụ nke Sicilies, Caroline. N'afọ 1816 kwa, Blacas ghọrọ onye otu Académie des Inscriptions et Belles-Lettres na Académie des Beaux-Arts. Mgbe nke ahụ gasịrị, a họpụtara ya ka ọ bụrụ onye nnọchi anya France na Holy See na Rome. Ọ bịanyere aka na nkwekọrịta n'etiti Bourbon France na Pope Pius nke Asatọ na 11 June 1817. Na 1820, ọ natara "Ordre du Saint-Esprit". Mgbe ọ ka bụ onye nnọchi anya na Rom, ọ bụ otu n'ime ndị nnọchi anya France atọ na Congress nke Laibach
n'afọ 1821.