Pax Vobiscum

We've started watching Season 2 of Borgia: Faith and Fear on Netflix, not to be confused with The Borgias on Showtime. In the last couple of episodes there has been a priest making trouble in Florence, and we recognized the actor as the advisor to the dragon lady from Game of Thrones. I'm trying to track this guy down and I'm looking for a summary and I'm not finding one. How can this be? Is this show really that far out on the fringe? I finally locate one in French. Google translates, and then I edited it. All I really needed were the names.

Borgia, Season 2, Episode 4 - Pax Vobiscum 

Cesare arrests Savonarola and has him tortured until he "confesses". Pope Alexander VI sentences him to death by hanging, and Cesare carries out the sentence. Savonarola uses his last breath to curse Cesare Borgia and his whole family. Cesare attends Midnight Mass and lights the traditional fireworks Florentine. Alessandro, his lifelong friend, wishes him "peace of God", but the peace of God no longer interests Cesare.

Iain Glen plays Savonarola, who was the instigator of the most infamous Bonfire of the Vanities. And here I thought it was just a clever name for a book.