Guest Stars Antonia Clarke as Sophia / Maria James Northcote as Alexander Bezborodko Adam El Hagar as Valerian Zubov Iain Mitchell as Archbishop Arsenius John Hodgkinson as Rumyantsev Felix Jamieson as Alexander Raphael Acloque as Platon Zubov Paul Hickey as English Ambassador Edmund Kente as Priest Albert Welling as German Ambassador