Title: List of compositions by Wolfgang Amadeus Mozart
Content: Horn Concerto No. 1 in D major, K. 412 (1791, unfinished at Mozart's death) ; Horn Concerto No. 2 in E major, K. 417 (1783) ; Horn Concerto No. 3 in E major, K. 447 (c. 1784–7) ; Horn Concerto No. 4 in E major, K. 495 (1786) Horn Concerto, K. 370b+371 in E major (1781) ; Horn Concerto, K. 494a in E major (c. 1785–6) Arguably the most widely played concertos for horn, the four Horn Concertos are a major part of most professional horn players' repertoire. They were written for Mozart's lifelong friend Joseph Leutgeb. The concertos (especially the fourth) were written as virtuoso vehicles that allow the soloist to show a variety of abilities on the valveless horns of Mozart's day. The Horn Concertos are characterized by an elegant and humorous dialogue between the soloist and the orchestra. Many of the autographs contain jokes aimed at the dedicatee. There are some other unfinished Mozart works for horn and orchestra: 
Title: Horn Concertos (Mozart)
Content:  The four Horn Concertos by Wolfgang Amadeus Mozart were written for his friend Joseph Leutgeb whom he had known since childhood. Leutgeb was a skilled player, as the works are difficult to perform on the natural horn of the period, requiring lip trills, much hand-stopping, and rapid tonguing.
Title: Horn Concerto No. 4 (Mozart)
Content:  Brussels Festival Orchestra, Robert Janssens (conductor), Marcophon ; 1987: Dale Clevenger (horn); Franz Liszt Chamber Orchestra, János Rolla (conductor), Sony ; 1987: Radovan Vlatković (horn); English Chamber Orchestra, Jeffrey Tate (conductor), Warner ; 1988: David Jolley (horn); Orpheus Chamber Orchestra, Deutsche Grammophon ; 1993: Frank Lloyd (horn); Northern Sinfonia, Richard Hickox (conductor), Chandos ; 1996: Luc Bergé (horn); Prima la Musica, Dirk Vermeulen (conductor), Eufoda ; 1997: David Pyatt (horn); Academy of St. Martin in the Fields, Sir Neville Marriner (conductor), Warner ; 2006: Johannes Hinterholzer (horn); Mozarteum Orchestra Salzburg, Ivor Bolton (conductor), Oehms ; 2011: Alessio Allegrini (horn); Orchestra Mozart, Claudio Abbado (conductor), Deutsche Grammophon ; 2018: Javier Bonet (horn); Munich Radio Orchestra, Hermann Baumann (conductor), ARSIS 
Title: Horn Concertos (Mozart)
Content: Horn Concerto No. 1 in D major, K. 412 (1791, unfinished at Mozart's death) ; Horn Concerto No. 2 in E-flat major, K. 417 (1783) ; Horn Concerto No. 3 in E-flat major, K. 447 (c. 1784–87) ; Horn Concerto No. 4 in E-flat major, K. 495 (1786) 
Title: Horn Concerto No. 4 (Mozart)
Content:  Wolfgang Amadeus Mozart's Horn Concerto No. 4 in E-flat major, K. 495 was completed in 1786.
Title: Horn Concerto No. 1 (Mozart)
Content:  Concerto No. 1 in D major, K. (412+514)/386b was written in 1791. The work is in two movements. Unusually, each movement received a distinct number in the first edition of the Köchel catalogue:  The concerto is scored for solo horn, two oboes, two bassoons, and strings. This is one of two horn concertos of Mozart to include bassoons (the other is K. 447), but in this one he "treats them indifferently in the first movement." It is the only one of Mozart's horn concertos to be in D major (the rest are in E-flat major) and the only one to have just two movements instead of the usual 
Title: Horn Concerto No. 2 (Mozart)
Content:  Wolfgang Amadeus Mozart's Horn Concerto No. 2 in E-flat major, K. 417 was completed in 1783. The concerto is scored for solo horn and an orchestra of two oboes, two horns, and strings. This is one of two horn concerti of Mozart to omit bassoons. It is also one of Mozart's two horn concerti to have ripieno horns (horns included in the orchestra besides the soloist), though in contrast to K. 495, the solo horn in this one does not duplicate the first ripieno horn's part in the tutti passages. Mozart's good-natured ribbing of his friend is evident in the manuscript inscription "W. A. Mozart took pity on Leitgeb, ass, ox and fool in Vienna on 27 May 1783."
Title: Horn Concerto No. 4 (Mozart)
Content: 1974: Hermann Baumann (natural horn); Concentus Musicus Wien, Nikolaus Harnoncourt (conductor), Teldec ; 1987: Anthony Halstead (natural horn); Hanover Band, Roy Goodman (conductor), Nimbus ; 1990: Timothy Brown (natural horn); Orchestra of the Age of Enlightenment, Sigiswald Kuijken (conductor), Erato ; 1993: Ab Koster (natural horn); Tafelmusik, Bruno Weil (conductor), Sony ; 1994: Anthony Halstead (natural horn); Academy of Ancient Music, Christopher Hogwood (conductor), L'oiseau lyre ; 2007: Teunis van der Zwart (natural horn); Freiburger Barockorchester, Gottfried von der Goltz, (conductor), Harmonia Mundi ; 2007: Paul Van Zelm (natural horn); Combattimento Consort Amsterdam, Jan Willem De Vriend, (conductor), Etcetera ; 2013: Roger Montgomery (natural horn); Orchestra of the Age of Enlightenment, Margaret Faultless (concert master/conductor), Signum ; 2015: Pip Eastop (natural horn); The Hanover Band, Anthony Halstead (conductor), Hyperion  In 1963 Flanders and Swann set the Rondo movement to words for their song "Ill Wind" from the album At the Drop of Another Hat.
Title: Horn Concerto No. 4 (Mozart)
Content: 1954: Dennis Brain (horn); Philharmonia Orchestra, Herbert Von Karajan (conductor), EMI ; 1964: Barry Tuckwell (horn); London Symphony Orchestra, Peter Maag (conductor), Decca ; 1970: Gerd Seifert (horn); Berliner Philharmoniker, Herbert von Karajan (conductor), Deutsche Grammophon ; 1972: Alan Civil (horn); Academy of St. Martin-in-the-Fields, Sir Neville Marriner (conductor), Philips ; 1975: Peter Damm (horn); Academy of St. Martin in the Fields, Sir Neville Marriner (conductor), Philips ; 1980: Günter Högner (horn); Wiener Philharmoniker, Karl Böhm (conductor), Deutsche Grammophon ; 1984: Barry Tuckwell (horn & conductor); English Chamber Orchestra, Decca ; 1985: Hermann Baumann (horn); St Paul Chamber Orchestra, Pinchas Zukerman (conductor), Philips ; 1985: Michael Thompson (horn); Philharmonia Orchestra, Christopher Warren-Green (conductor), Nimbus ; 1985: Francis Orval 
Title: Horn Concerto No. 2 (Mozart)
Content: 2018: Javier Bonet (horn); Munich Radio Orchestra, Hermann Baumann (conductor), ARSIS. A recording with all the Mozart horn Concertos including the Rondó KV 371 and the Horn quintet KV 407 Given its duration (no more than 20 minutes), the Concerto is typically grouped with Mozart's other 3 for the instrument. The foremost example is Dennis Brain's November 1953 recording of the four horn concertos on EMI with The Philharmonia Orchestra conducted by Herbert von Karajan.

Question: who did mozart write his four horn concertos for?
Answer: wolfgang amadeus mozart used story by pierre beaumarchais.