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 Paul Hickey as English Ambassador Albert Welling as German Ambassador Raphael Acloque as Platon Zubov Edmund Kente as Priest Felix Jamieson as Alexander