Guest Stars Peter Sullivan as Cardinal Ascanio Sforza Vernon Dobtcheff as Cardinal Versucci Bosco Hogan as Cardinal Piccolomini Gina McKee as Caterina Sforza Sebastian De Souza as Alfonso of Aragon Thure Lindhardt as Rufio John Rado as Cardinal Colonna Peter Stebbings as Cardinal De Luca David Dencik as Cardinal Orsini Antal Leisen as Cardinal 2 Péter Kertész as Cardinal 1 Andrew Gower as Assassin 1 Lukács Bicskey as Guard William Ruane as Papal Physician Tam Dean Burn as Dominican Prior Mark Phelan as Morgue Worker Barna Ilyes as Dominican Monk Mackenzie Munro as Concetta Ákos Horváth as Vatican Guard