Question: The football league in which Robert Leonard Arber played as a defender was founded in what year?

Context articles: Tom McDonald (Australian footballer)
Jayden Hunt
List of Lincoln City F.C. players
Sheffield United F.C. league record by opponent
Dutch McCall
Bobby Arber
English Football League
Cecil Leonard
Len Stephenson
List of Nelson F.C. players

Tom McDonald (born 18 September 1992) is a professional Australian rules footballer playing for the Melbourne Football Club in the Australian Football League (AFL).
 A defender, 1.94 m tall and weighing 101 kg , McDonald is a key position backman, playing as either a full back or centre half-back.
 He spent his final junior year playing in the TAC Cup for the North Ballarat Rebels and played top-level football when he played two matches for North Ballarat in the Victorian Football League (VFL).
 He was recruited by the Melbourne Football Club with the fifty-third overall selection in the 2010 AFL draft and made his AFL debut during the 2011 season.
 His second year saw him earn a Rising Star nomination playing in Melbourne's backline, and finished sixth overall.
 He has since become Melbourne's main key defender and has finished in the top ten of the club's best and fairest in every season he's played, apart from 2011 where he played just two matches.
Jayden Hunt (born 3 April 1995) is a professional Australian rules footballer playing for the Melbourne Football Club in the Australian Football League (AFL).
 A defender, 1.87 m tall and weighing 85 kg , Hunt plays primarily on the half-back flank with the ability to also play on the wing.
 He was born into an Australian rules football family with both his great-uncle and uncle playing in the Victorian Football League (now the Australian Football League).
 He played his final junior football year in school sports and did not play any football at under-18 level.
 Despite this, he was recruited by the Melbourne Football Club with the fifty-seventh selection in the 2013 AFL draft.
 After persistent injuries in his first two years, he made his AFL debut during the 2016 season.
Lincoln City Football Club, an English association football club based in Lincoln, Lincolnshire, was founded in 1884, and first entered the FA Cup in the 1884–85 season.
 When nationally organised league football in England began, the club joined the Combination, a league set up to provide organised football for those clubs not invited to join the Football League which was to start the same year.
 When that league folded, Lincoln became founder members of the Midland League, and won the inaugural league title.
 They then spent a year in the Football Alliance before being elected to the newly formed Second Division of the Football League.
 Lincoln moved in and out of the Football League until they became founder members of the Football League Third Division North in 1921.
 They remained in the Football League until 1987, when they became the first club to suffer automatic relegation to the Football Conference.
 They returned to the League after just one season, remained at that level until they were again relegated in 2011, and returned once more in 2017.
Sheffield United Football Club is an English association football club based at Bramall Lane in Sheffield, South Yorkshire, who currently compete in Football League One.
 Founded in 1889, they played only friendlies during their first year in existence before being elected to the Midland Counties League for the 1890–91 season.
 The football committee (who ran the club at the time) were unhappy with the quality of the Midland Counties League and so resigned in the summer of 1891.
 However, United were refused entry into The Football League amidst an acrimonious dispute with local rivals The Wednesday who had lobbied against their application.
 Instead United joined the newly formed Northern League which mainly consisted of teams from the North East of England, resulting in their nearest away fixture being at Darlington, some 85 miles away.
 Sheffield United again applied for election to The Football League the following year, this time being successful, and were admitted to the new Second Division in 1892.
 Despite the club's desire to be part of the Football League some committee members felt it may not last and so United remained with the Northern League for one more season, thus competing in two leagues concurrently during the 1892–93 season.
 Since that time United have remained in either the Football League, or at times the Premier League (during the 1992–93, 1993–94 and 2006–07 seasons), although changing fortunes have meant that they have competed in all four of the top divisions in England at some stage.
Robert Leonard "Dutch" McCall (December 27, 1920 – January 8, 1996) was a pitcher in Major League Baseball.
 He played for the Chicago Cubs.
Robert Leonard Arber (born 13 January 1951) is an English former professional footballer who played in the Football League, as a defender.
 After retiring from playing, he managed Barking between January 1985 and December 1986.
The English Football League (EFL) is a league competition featuring professional football clubs from England and Wales.
 Founded in 1888 as the Football League, the league is the oldest such competition in world football.
 It was the top-level football league in England from its foundation in the 19th century until 1992, when the top 22 clubs split away to form the Premier League.
Cecil Leonard (born July 20, 1946) is a former American football defensive back who played two seasons with the New York Jets of the American Football League (AFL) and National Football League (NFL).
 He was drafted by the Jets in the eighth round of the 1969 NFL Draft.
 He played college football at Tuskegee University and attended East Highland High School in Sylacauga, Alabama.
 Leonard was also a member of the Birmingham Americans of the World Football League (WFL).
Robert Leonard Stephenson (14 July 1930 – 29 September 2014) was an English footballer.
 A centre-forward, he scored 26 goals in 93 league games in a seven-year career in the Football League for Blackpool, Port Vale, and Oldham Athletic.
Nelson F.C. is an English semi-professional association football club based in the town of Nelson, Lancashire.
 The club was founded in 1881 and initially played in the Lancashire Combination.
 In 1921, Nelson became a professional outfit when they were one of the teams selected to play in the inaugural season of the newly formed Football League Third Division North.
 The team played in the Football League for the following 10 years, enjoying a season in the Second Division in 1923–24.
 Nelson were relegated from the Football League in 1931, failing re-election after finishing bottom of the league.
 Defender Clement Rigg amassed the most league appearances for Nelson during this period with 254.
 The highest goalscorer was Joe Eddleston who netted on 97 occasions for the club before transferring to Swindon Town in 1926.