Question: What was the league of the sports team that Mike Volcan played on?

full_context: Document 1: Toronto Argonauts: The Toronto Argonauts (officially the Toronto Argonaut Football Club, commonly referred to as the Argos) are a professional Canadian football team competing in the East Division of the Canadian Football League (CFL). Based in Toronto, Ontario, the team was founded in 1873, and is the oldest existing professional sports team in North America still using its original name, and they are the oldest-surviving team in both the modern-day CFL and East Division. The team's origins date back to a modified version of rugby football that emerged in North America in the latter half of the nineteenth century. The Argonauts played their home games at Rogers Centre from 1989 until 2016 when the team moved to BMO Field, the fifth stadium site to host the team.
Document 2: Winnipeg Blue Bombers: The Blue Bombers were founded in 1930 as the Winnipeg Football Club, which remains the organization's legal name today. Since that time, they have won the league's Grey Cup championship 10 times, most recently in 1990. With 10 wins, they have the third - highest win total in the Grey Cup among active and defunct CFL teams. Though they are currently the team with the longest Grey Cup drought (and in the West Division overall (although their 1990 win, their most recent, came when they played in the East Division)), no other CFL franchise has as many Grey Cup appearances as the Blue Bombers' current 25. The Blue Bombers were the first team not located in Ontario or Quebec to win a championship.
Document 3: Ottawa Rough Riders: The Ottawa Rough Riders were a Canadian Football League team based in Ottawa, Ontario, founded in 1876. Formerly one of the oldest and longest lived professional sports teams in North America, the Rough Riders won the Grey Cup championship nine times. Their most dominant era was the 1960s and 1970s, a period in which they won five Grey Cups. The team's fortunes waned in the 1980s and 1990s and they ultimately ceased operations following the 1996 season. Five years later, a new CFL team known as the Ottawa Renegades was founded, though they suspended operations in 2006. The Ottawa Redblacks, who own the Rough Riders intellectual properties, joined the league in 2014.
Document 4: Sean Kehoe: Born in Edmonton, Alberta, Kehoe joined his hometown Edmonton Eskimos in 1981 and was part of the last two Grey Cup victories of that great dynasty. He moved to the Winnipeg Blue Bombers in 1983. In 1984 he won the Grey Cup again and was named the Dick Suderman Trophy winner (rushing for 89 yards.) His two best seasons were 1985, when he caught 54 passes for 513 yards, and 1986 when he snagged another 45 for 440 yards. Over six seasons he rushed for 571 yards, caught 156 passes for 1482 yards, and scored 8 touchdowns.
Document 5: Stanley Blair: Coming out of the Southeastern Oklahoma State University football program, Blair joined the Edmonton Eskimos in 1987 and took the CFL by storm, capturing the Jackie Parker Trophy as best rookie in the West and winning a Grey Cup. His blocked kick in the 75th Grey Cup classic was instrumental. He played two more seasons in Edmonton and was selected as an all-star in each. He was courted by many National Football League teams, but signed with the Phoenix Cardinals and played only 5 games with them before injuries ended his career.
Document 6: Mike Gray (Canadian football): After playing his college football at the University of Oregon Gray started his pro career with the British Columbia Lions in 1985. He played 16 games and had 13 sacks, good for an all-star nod and the CFL's Most Outstanding Rookie Award. After 8 sacks in 1986, the Lions lost Gray to the Ottawa Rough Riders in the equalization draft. Ottawa released him and he began a 7-year stay with the Winnipeg Blue Bombers, playing 107 regular season games and being named an Eastern all-star in 1989.
Document 7: Mike Volcan: Michael Volcan (September 17, 1932 – June 25, 2013) was a Canadian football player who played for the Edmonton Eskimos. He won the Grey Cup with the Eskimos in 1955 and 1956. Volcan was born and raised in Hamilton, Ontario and played football at the Hamilton Technical Institute and Kitchener-Waterloo Dutchmen. He won the Joe Clarke Memorial Trophy as the Eskimos MVP in 1962. He died in Edmonton in 2013.
Document 8: Don Barry (Canadian football): Donald Joseph Barry (June 23, 1931 – May 30, 2014) was a Canadian football player who played for the Edmonton Eskimos. He won the Grey Cup with them in 1954, 1955 and 1956. Barry was born in Edmonton He was inducted into the Alberta Sports Hall of Fame in 2007 and the City of Edmonton's Hall of Fame in 2010. Don also contributed to Canadian football as a coach in Edmonton: St. Joseph’s High School; St. Anthony’s College, Edmonton Huskies, Edmonton Wildcats, and the University of Alberta Golden Bears (1967-1979: earning two Vanier Cups). He was proud to have been a guest coach (Offensive Line) in the 1987 CFL Players Association All-Star Game. He later retired to Canmore, Alberta where he died in 2014.
Document 9: Glenn McWhinney: Glenn Simpson "Keeper" McWhinney (August 10, 1930 – April 14, 2012) was a Canadian football player who played for the Edmonton Eskimos and Winnipeg Blue Bombers. He won the Grey Cup with the Eskimos in 1954. McWhinney's football career was ended in 1956 when he sustained a broken neck. He later joined the Blue Bombers as a scout from 1956 to 1958. McWhinney also played basketball in the Winnipeg Men's Senior League. He died in 2012; a park in Winnipeg is named after him.
Document 10: Calgary Flames: The team was founded in 1972 in Atlanta as the Atlanta Flames until relocating to Calgary in 1980. The Flames played their first three seasons in Calgary at the Stampede Corral before moving into their current home arena, the Scotiabank Saddledome (originally known as the Olympic Saddledome), in 1983. In 1985 -- 86, the Flames became the first Calgary team since the 1923 -- 24 Tigers to compete for the Stanley Cup. In 1988 -- 89, the Flames won their first and only championship. The Flames' unexpected run to the 2004 Stanley Cup Finals gave rise to the Red Mile, and in 2011 the team hosted and won the second Heritage Classic outdoor game.
Document 11: Michaels Park, Edmonton: Michaels Park is a residential neighbourhood in the Millbourne community of Mill Woods in south east Edmonton, Alberta, Canada. The neighbourhood is named for John "Mike" Michaels, best known for being Edmonton's preeminent news stand operator - "Mike's News Stand" - which he opened in 1912 upon immigrating to Edmonton from New York. In 1913 he founded the Edmonton Newsboys' Band in an effort to keep his newsboys, often school drop-outs, out of trouble. The band gained international recognition, performing throughout the United States, Canada, and England. John Michaels was also "involved in community service for 50 years and was best known for his promotion of aviation and the north country."
Document 12: Canadian football: Canadian football has mostly been confined to Canada, with the United States being the only other country to have hosted a high-level Canadian football game. The CFL's controversial "South Division" as it would come to be officially known attempted to put CFL teams in the United States playing under Canadian rules between 1992 and 1995. The move was aborted after three years; the Baltimore Stallions were the most successful of the numerous Americans teams to play in the CFL, winning the 83rd Grey Cup. Continuing financial losses, a lack of proper Canadian football venues, a pervasive belief that the American teams were simply pawns to provide the struggling Canadian teams with expansion fee revenue, and the return of the NFL to Baltimore prompted the end of Canadian football on the American side of the border.
Document 13: Ken Reed (Canadian football): Kenneth Woodrow Reed (November 24, 1941 – September 5, 2014) was a Canadian football player who played as a linebacker for the Edmonton Eskimos and the Saskatchewan Roughriders; he won the Grey Cup in 1966. Born in Poplar Bluff, Missouri, he was an alumnus of the University of Tulsa. Reed, 72 and his wife died in a car accident in 2014 on the Alaska Highway near Fort St. John, British Columbia.
Document 14: Edmonton Eskimos: The Edmonton Eskimos are a professional Canadian football team based in Edmonton, Alberta, competing in the West Division of the Canadian Football League (CFL). The Eskimos play their home games at The Brick Field at Commonwealth Stadium and are the third-youngest franchise in the CFL. The Eskimos were founded in 1949, although there were clubs with the name Edmonton Eskimos as early as 1895. The Eskimos are arguably the most successful CFL franchise of the modern era (since 1954), having won the league's Grey Cup championship fourteen times, second overall only to the Toronto Argonauts who have won seventeen. This includes a three-peat between 1954 and 1956 and an unmatched five consecutive wins between 1978 and 1982, and most recently in 2015.
Document 15: Calgary Stampeders: The Calgary Stampeders are a professional Canadian football team based in Calgary, Alberta, competing in the West Division of the Canadian Football League (CFL). The Stampeders play their home games at McMahon Stadium and are the third-oldest active franchise in the CFL. The Stampeders were officially founded in 1945, although there were clubs operating in Calgary as early as 1909.
ground_truth: Canadian Football League
sub_queries: Mike Volcan >> member of sports team Answer: Edmonton Eskimos
What league was Edmonton Eskimos ? Answer: Canadian Football League