Sabrina Bartlett on Knightfall Sabrina Bartlett secured a leading role on the period drama Knightfall as Princess Isabella, a fictionalised version of a real-life royal of the 14th century. She seems to have a knack for TV shows that take place in the past, with roles on Poldark and Victoria, not to mention a crucial but small role on Game of Thrones. Image Source: Everett Collection