Whakakīhia te rerenga e whai ake nei: He koati hara mo nga mahi rangatira o te tau 1814, i whakaraua a Blacas i a ia hei karere a Parani ki te kooti o te Kingi o nga Sicilies e rua, kei Naples tona taone nui. I reira, i whiriwhiria e ia te marena o te tau 1816 o te teina o Louis XVIII, te Duke o Berry, ki a Francis I o nga tamahine a Caroline o nga Sicilies e rua. I te tau 1816, ka noho a Blacas hei mema o te Académie des Inscriptions et Belles-Lettres me te Académie des Beaux-Arts. I muri mai, i tohua ia hei karere French ki te Holy See i Roma. I hainatia e ia he whakaaetanga i waenga i a Bourbon France me Pope Pius VII i te 11 o Pipiri 1817. I te tau 1820, i whakawhiwhia ki a ia te "Ordre du Saint-Esprit". I a ia e noho ana hei karere i Roma, ko ia tētahi o ngā māngai French e toru ki te
Ko te Huihuinga o Laibach i te tau 1821.