Vikings season 6: Who is Dir? Is Dir based on a real person?

VIKINGS season 6 sees part of the historical drama take place in the Kievan Rus’. Ivar the Boneless travelled East at the end of the last series and has recently been acquainted with Prince Oleg of Novgorod and a prisoner named Dir. Who is Dir and what happened to him? Express.co.uk has everything you need to know.