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