..although, in place of your "treacherous/perfidious swine" I would prefer "FAITHLESS swine" and those are in fact the words used in the most startling line from one of the most startling movies Hollywood has produced to date...

You just have to work out who M is ("O Merrice") and you have the citation entire,

In Guillelmo Petro Blattio,
Trimalch.