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Romain Gary
Romain Gary (pronounced [ʁɔ.mɛ̃ ga.ʁi]; 21 May [O.S. 8 May] 1914 – 2 December 1980), born Roman Kacew (pronounced [kat͡sɛf], and also known by the pen name Émile Ajar), was a French novelist, diplomat, film director, and World War II aviator. He is the only author to have won the Prix Goncourt under two names. He is considered a major writer of French literature of the second half of the 20th century. He was married to Lesley Blanch, then Jean Seberg.
Source: Wikipedia