Question: Before 2012, who were the Baylor Bears sports rival?
Context: The Baylor Bears football program is a college football team that represents Baylor University in the Big 12 Conference in the National Collegiate Athletic Association.  The team has had 25 head coaches since it started playing organized football in 1899.  Baylor was a charter member of the Southwest Conference (SWC), joining in 1915.  They later became a charter member of the Big 12 in 1996 when the SWC disbanded.  After playing without a nickname for 15 years, the school chose "Bears" as the team nickname in 1914.  There were three seasons where Baylor did not field a team.  In 1906, the university banned football due to the violent nature of the sport.  However, student protests persuaded school officials to reinstate it the next year.  In 1943 and 1944, the school cancelled the football program due to World War II.  The Bears have played in 1,099 games during their 108 seasons.  In those seasons, seven coaches have led Baylor to postseason bowl games: Bob Woodruff, George Sauer, Sam Boyd, John D. Bridgers, Grant Teaff, Chuck Reedy, and Art Briles.  Five coaches have won conference championships with the Bears: Charles P. Mosley, Frank Bridges, Teaff, Reedy and Briles. The Battle of the Brazos was the official collegiate sports rivalry between the Baylor Bears and Texas A&M Aggies.  The rivalry is named for the Brazos River that flows by the two schools, which are only 90 miles apart.  The Battle of the Brazos debuted in 1899.  The rivalry officially folded in 2012, when Texas A&M left the Big 12 to join the Southeastern Conference. Texas A&M Aggies (variously A&M or Texas Aggies) refers to the students, graduates, and sports teams of Texas A&M University.  The nickname "Aggie" was once common at land-grant or "Ag" (agriculture) schools in many states.  The teams compete in Division I of NCAA sports.  Texas A&M was a charter member of the Southwest Conference until its dissolution and subsequent formation of the Big 12 Conference in 1996.  The Aggies competed in the Big 12 until joining the Southeastern Conference (SEC) on July 1, 2012.  Texas A&M's official school colors are maroon and white.  The teams are referred to as Aggies and the mascot is a Rough Collie named Reveille. The 1980 Baylor Bears football team represented the Baylor University in the 1980 NCAA Division I-A football season.  The Bears finished the season first in the Southwest Conference.  During Mike Singletary's senior season of 1980, Baylor won 10 games for the only time in school history.  Throughout his Baylor career, Singletary averaged 15 tackles per game.  After Baylor's 16–0 victory over Texas in the regular season finale, the Longhorns did not suffer another shutout for 24 years, which was one of the longest non-shutout streaks in college football history. The 1972 Baylor Bears football team represented the Baylor University in the 1972 college football season.  Grant Teaff was hired to resurrect the moribund football team at Baylor.  Baylor originally hired Rudy Feldman from New Mexico, but Feldman quit after one day, leaving the job to Teaff.  Baylor had been 7–43–1 in the five seasons preceding Teaff's arrival.  The Bears offense scored 180 points, while the Bears defense allowed 156 points.  In the Battle of the Brazos, the Bears beat Texas A&M by a score of 15–13. Lawrence Dale Isbell (January 8, 1930 – October 31, 1978) was an American baseball and gridiron football player.  He was one of the rare players to be All-American in both baseball in football.  He was an All-American quarterback in 1951, when he guided the Baylor Bears football team to the Orange Bowl; he threw for 26 career touchdowns in college.  In 1952, he was named the All-American catcher by the American Baseball Coaches Association.  That season, he set a school record with a .431 average; through 2008, he still ranked second in Baylor Bears baseball annals for best single-season average, behind Mickey Sullivan.  Isbell played minor league baseball for the Boston Red Sox and Brooklyn Dodgers organizations.  He also played five years of professional football in the Canadian Football League (CFL) as a defensive back with the Saskatchewan Roughriders.  He is a member of the Texas Sports Hall of Fame. The 2014 Baylor Bears baseball team represents Baylor University in the 2014 college baseball season.  Baylor competes in Division I of the National Collegiate Athletic Association (NCAA) as a charter member of the Big 12 Conference.  The Bears play home games at Baylor Ballpark on the university's campus in Waco, Texas.  Twenty year head coach Steve Smith leads the Bears, a former pitcher for the team during the 1982 and 1983 seasons. The 1986 Baylor Bears football team represented the Baylor University in the 1986 NCAA Division I-A football season.  The Bears offense scored 325 points, while the Bears defense allowed 207 points.  The Bears finished the season second in the Southwest Conference.  In the Battle of the Brazos, "Texas Football" magazine voted the 1986 football game between Baylor and Texas A&M the outstanding game of the Southwest Conference]of the 1980s.  Texas A&M overcame a 17–0 deficit, and won the game 31–30 and later advanced to the Cotton Bowl Classic. The Baylor Bears are the athletic teams that represent Baylor University.  Baylor's men's sports teams are named the Bears, and some women's teams are named the Lady Bears.  The teams participate in Division I of the National Collegiate Athletic Association (NCAA) as one of only two private school members of the Big 12 Conference.  Prior to joining the Big 12, Baylor was a member of the Southwest Conference from their charter creation in 1914 until its dissolution in 1996.  Baylor is also a founding member of the Big 12 Conference. The Baylor Bears football statistical leaders are individual statistical leaders of the Baylor Bears football program in various categories, including passing, rushing, receiving, total offense, defensive stats, and kicking.  Within those areas, the lists identify single-game, single-season, and career leaders.  The Bears represent the Baylor University in the NCAA's Big 12 Conference.
Answer: Texas A&M Aggies