Question: William Ashley Magarey is best nown for coming up with an idea of a medal in which league?
Context: Anthony Henry Ashley-Cooper (5 May 1807 at Wimborne St Giles, Dorset – 2 December 1858 at Clewer, Berkshire) was an English politician and cricketer with amateur status.  Henry Ashley, as he was called, was a son of Cropley Ashley-Cooper, 6th Earl of Shaftesbury, and younger brother of Anthony Ashley-Cooper, 7th Earl of Shaftesbury, and of Anthony William Ashley.  He was a member of parliament for Dorchester from 1831 to 1847. William Ashley Freehan (born November 29, 1941) is a former catcher in Major League Baseball who played his entire 15-year career with the Detroit Tigers.  The premier catcher in the American League for several years from the 1960s into the early 1970s, he was named an All-Star in each of the eleven seasons in which he caught at least 75 games, and was the MVP runnerup with the 1968 champions for his handling of a pitching staff that included Mickey Lolich and Denny McLain, who became the first 30-game winner in the majors since 1934.  A five-time Gold Glove Award winner, Freehan held the major league record for highest career fielding percentage (.9933) until 2002, and also the records for career putouts (9,941) and total chances (10,734) from 1975 until the late 1980s; he ranked ninth in major league history in games caught (1,581) at the end of his career.  His career totals of 200 home runs and 2,502 total bases placed him behind only Yogi Berra and Bill Dickey among AL catchers when he retired. The English historical school of economics, although not nearly as famous as its German counterpart, sought a return of inductive methods in economics, following the triumph of the deductive approach of David Ricardo in the early 19th century.  The school considered itself the intellectual heirs of past figures who had emphasized empiricism and induction, such as Francis Bacon and Adam Smith.  Included in this school are William Whewell, Richard Jones, Thomas Edward Cliffe Leslie, Walter Bagehot, Thorold Rogers, Arnold Toynbee, William Cunningham, and William Ashley. William Ashley Kirby (born 12 September 1975) is an Australian swimmer who was competitive on an international level in the nineties and early 2000s.  He specialized in freestyle and butterfly and won a gold medal at the 2000 Summer Olympics in Sydney as part of the 4 × 200 m freestyle relay team.  He was an Australian Institute of Sport scholarship holder. The Reserves Magarey Medal is an Australian rules football honour awarded annually since 1906 to the fairest and most brilliant player in the South Australian National Football League (SANFL) Reserves competition, as judged by field umpires.  The award is based on the Magarey Medal award that was introduced by William Ashley Magarey. Stephen Kenna (born 8 October 1981) is a former Australian rules footballer who played with Carlton in the Australian Football League (AFL).  After being delisted by Carlton, Kenna moved to South Adelaide in the South Australian National Football League (SANFL).  He played 48 games for South Adelaide, coming second in the 2006 Magarey Medal and representing the SANFL twice, before returning to Melbourne midway through 2007.  Once back in Melbourne, Kenna played for Box Hill in the Victorian Football League (VFL), whom he had played for before being drafted by Carlton.  He won the club's best and fairest in 2008 and was captain of the club in 2009 and 2010.  Kenna is now teaching at Kalinda Primary School in Ringwood, Melbourne. Martin William Ashley MVO Dipl Arch RIBA (born 29 April 1952) is a British architect known for restoration of ecclesiastical buildings and royal properties and a specialist in period and listed buildings.  He studied a Diploma in Architecture at Kingston Polytechnic and completed a scholarship with Society for the Protection of Ancient Buildings in 1976.  He worked for Purcell Miller Tritton and became a partner before setting up his own business, Martin Ashley Architects, in 1994.  From 1999 to present, Martin Ashley has held the post of Surveyor of the Fabric St Georges Chaple, Windsor.  In 2011 Martin Ashley was honoured with Member of the Royal Victorian Order He is an architect member of Guildford Diocesan Advisory Committee, and lectures on the philosophy and principles of historic building conservation. William Ashley Magarey (30 January 1868 – 18 October 1929) was a lawyer, sportsman and sports administrator.  He was the first chairman of the South Australian Football Association (SAFA) (later named South Australian National Football League (SANFL)), and a South Australian first-class cricketer, but he is best known for coming up with the idea of the Magarey Medal. The Compatriots Club was an unofficial grouping of British Conservatives between 1904 and 1914.  According to E. H. H. Green, the Club "was made up of a membership of Conservative MPs, academics, journalists, and writers, functioned as a form of ‘think tank’ to generate Conservative ideas on the economy, imperial relations, defence, and other issues".  Members included William Cunningham, William Hewins, William Ashley, Lord Milner, Leo Amery, John Waller Hills and Arthur Steel-Maitland. The Magarey Medal is an Australian rules football honour awarded annually since 1898 to the fairest and most brilliant player in the South Australian National Football League (SANFL), as judged by field umpires.  The award was created by William Ashley Magarey, then chairman of the league.
Answer: South Australian National Football League