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'''Juan de la Cierva y Codorníu, 1st Count of la Cierva''' ({{IPA-|es|ˈxwan de la ˈθjeɾβaj koðoɾˈni.u|}}; 21 September 1895 – 9 December 1936), was a Spanish [[civil engineer]], pilot and a self-taught aeronautical engineer. His most famous accomplishment was the invention in 1920 of a [[rotorcraft]]<ref>{{cite book|author=George Galdorisi|title=Leave No Man Behind: The Saga of Combat Search and Rescue|url=https://books.google.com/books?id=T3HGfuFILuoC|publisher=Voyageur Press|isbn=978-0-7603-2392-2|year=2008}}</ref><ref>{{cite book|author=Trevor Homer|title=The Book of Origins: The first of everything|url=https://books.google.com/books?id=J-eTGAAACAAJ|publisher=Hachette Digital|isbn=978-1-405-51610-5|year=2007}}</ref> called ''Autogiro'',<ref name="aero_digest">''Aero Digest'', Feb 1939, p. 27</ref> a single-rotor type of aircraft that came to be called [[autogyro]] in the English language. In 1923, after four years of experimentation, De la Cierva developed the articulated rotor, which resulted in the world's first successful flight of a stable rotary-wing aircraft, with his [[Cierva C.4|C.4]] prototype.
==Early life==
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