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For Oscar-nominated British actor Chiwetel Ejiofor, starring in a film about Nigeria's civil war was "incredibly personal", as the conflict both affected close relatives and determined the country where he was born. His own grandfather had lived through the nightmare played out in "Half of a Yellow Sun", which premiers in Nigeria on Friday, and spent long hours years later recounting the painful memories to Ejiofor. The movie -- now showing in Britain and Australia and opening soon in the US and other countries -- is based on the best-selling novel by Chimamanda Ngozi Adichie about the 1967-1970 Biafra War, which began after the eastern region tried to secede from newly independent Nigeria. "The Biafra War was a seminal part of my upbringing and my family history," said Ejiofor, 36, the first black actor from Britain nominated for a Best Actor Oscar.