evidence: FACT CHECK: Did Prince Harry Attempt To Convince Cillian Murphy He Is British And Not Irish? A post shared on social media purportedly shows "Oppenheimer" actor Cillian Murphy arguing about his nationality with Prince Harry. [...] The Facebook post shows the actor at a screening of his film "Dunkirk" in 2017. The cast is seen standing in front of the poster for the film when Prince Harry introduces himself and continually asks Murphy if he is British despite him telling the royal he is Irish.