Question: Who in the Jewish Guild did The Irish Football Association consider to be the greatest player to ever pull on the green shirt of Northern Ireland?
Context: The Northern Ireland national football team represents Northern Ireland in international association football.  From 1882 to 1921 all of Ireland was represented by a single side, the Ireland national football team, organised by the Irish Football Association (IFA).  In 1921, the jurisdiction of the IFA was reduced to Northern Ireland following the secession of clubs in the soon-to-be Irish Free State, although its team remained the national team for all of Ireland until 1950, and used the name "Ireland" until the 1970s.  The Football Association of Ireland (FAI) organises the separate Republic of Ireland national football team. The Irish Football Association Challenge Cup (also known as the Tennent's Irish Cup for sponsorship purposes) is the national football knock-out cup competition in Northern Ireland.  Inaugurated in 1881, it is the fourth-oldest national cup competition in the world.  Prior to the break-away from the Irish Football Association by clubs from what would become the Irish Free State in 1921, the Irish Cup was the national cup competition for the whole of Ireland.  Linfield are the current holders after beating Coleraine 3-0 in the 2017 final. The Northern Ireland Football League Cup, also known as the Irish League Cup, and the BetMcClean.com League Cup is a national football knock-out cup competition in Northern Ireland open to the 40 Northern Ireland Football League clubs.  It is the third-highest rated competition in domestic Northern Irish football after the NIFL Premiership and Irish Cup.  It should not be confused with the Irish League Floodlit Cup which ran from 1987–88 to 1997–98 initially under the sponsorship of Budweiser and latterly Coca-Cola.  Unlike the Irish Cup, the competition does not have a berth for UEFA Europa League qualification, however the winners qualify for the next season's all-Ireland Setanta Sports Cup.  The cup is operated by the Northern Ireland Football League, who in 2013 took over the administration from the Irish Football Association (IFA) for the 2013–14 season onwards, after which the cup was renamed as the Northern Ireland Football League (NIFL) Cup. The Jewish Guild is a social club in suburban Johannesburg, South Africa, that was founded in the late 19th century.  In its heyday, they fielded a football side that came runners up in the South African cup competition and even fielded George Best. George Best (22 May 1946 – 25 November 2005) was a Northern Irish professional footballer who played as a winger for Manchester United and the Northern Ireland national team.  In 1968, he won the European Cup with Manchester United, and was named the European Footballer of the Year and FWA Footballer of the Year.  The Irish Football Association described him as the "greatest player to ever pull on the green shirt of Northern Ireland". The Northern Ireland national under-16 schools football team (also known as Northern Ireland schoolboys, under-16s or U16) represents Northern Ireland in association football at under-16 level.  It is controlled by the Northern Ireland Schools Football Association (NISFA) which is affiliated to the Irish Football Association.  The main competition competed for by the team is the Victory Shield which has been competed for since 1925 by the same four teams (England, Northern Ireland, Scotland and Wales).  The Northern Ireland under-16 side also competes regularly in other minor tournaments and in friendlies.  The team had previously been fielded at under-15 level and games are still sometimes arranged at this age group level with the agreement of the opposition association. The Northern Ireland Football League Premiership, known as the Danske Bank Premiership for sponsorship purposes, is a professional association football league which operates as the highest division of the Northern Ireland Football League – the national league in Northern Ireland.  It was formerly called the "IFA Premiership" until 2013, with previous competition formats called the "Irish Premier League", "Irish Football League Premier Division", and before that simply the "Irish Football League".  Still known in popular parlance simply as the "Irish League", the Premiership was established in 2008 under the auspices of the Irish Football Association before the Northern Ireland Football League was created for the start of the 2013–14 season.  At the end of the season, the champion club is presented with the Gibson Cup. The Northern Ireland national football team represents Northern Ireland in international association football.  From 1882 to 1921 all of Ireland was represented by a single side, the Ireland national football team, organised by the Irish Football Association (IFA).  The Football Association of Ireland (FAI) organises the separate Republic of Ireland national football team. Association football in Northern Ireland, widely known as football or sometimes as soccer (to avoid confusion with Gaelic football), is one of the most popular sports in Northern Ireland.  The governing body in Northern Ireland is the Irish Football Association (IFA) (not to be confused with the Football Association of Ireland (FAI) in the Republic of Ireland).  Gaelic football, rugby union and association football are the most popular sports in Northern Ireland. The Northern Ireland national under-19 football team (also known as Northern Ireland under-19, under-19s or U19) represents Northern Ireland in association football at under-19 level.  It is controlled by the Irish Football Association and began under the name of Ireland Youth when the Home Nations first held a round robin of friendly matches in 1948.  The same year they entered the first International Youth Tournament, now the UEFA European Under-19 Football Championship.  Their best performance was in 1963 when they finished as runner-up.  The team evolved into the Northern Ireland under-18 team then the current under-19 team.  As well as the UEFA Under-19 Championships the team also enters the annual Milk Cup (currently as an under-20 side).  In addition, the team plays regular friendlies, sometimes as an under-20 or under-18 team by agreement of the opposing association.
Answer: George Best