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'''Clive Staples ("C.S.") Lewis''' (born November 29, 1898, [[Belfast]] - d. November 22, 1963, [[Oxford]]) was an [[Ireland|Irish]] writer, novelist, essayist, moral mythologist, philosopher and a world-acclaimed master of [[Christian apologetics]]. He is considered by many to have been the greatest intellectual defender of [[Christianity]] in the 20th century. He is famous for writing ''[[Mere Christianity]]'' (3 books), ''[[The Chronicles of Narnia]]'' and, before that, ''[[The Screwtape Letters]]''. It is estimated that more than 200 million copies of his books, which total 21 (some count 40), have sold. He wrote 3,200 letters. <ref>https://christianhistoryinstitute.org/magazine/article/spending-a-pleasant-hour-with-lewis</ref> '''''C.S. Lewis converted from [[atheism]] to [[Christianity]] based on reasoning and logic'''''.