Cardinal Alberoni (1664-1752)
During the War of the Spanish Succession Alberoni laid the foundation of his political success by the services he rendered to Louis-Joseph, duc de Vendôme, commander of the French forces in Italy, to whom the duke of Parma had sent him. That a low-ranking priest was used as envoy was due to the duke's rude manners: the previous envoy, the bishop of Parma, had quit because the duke had wiped his buttocks in front of him: Saint-Simon in his Mémoires relates that Alberoni gained Vendôme's favor when he was received in the same way, but reacted adroitly by kissing the duke's buttocks and crying "O culo di angelo!". The duke was amused, and this joke started Alberoni's brilliant career. When the French forces were recalled in 1706, he accompanied the duke to Paris, where he was favourably received by Louis XIV.
(quoted from Wikipedia)