Question: Right before the start of the 2012-2013 season, who was the Brazilian central defender the FC Bayern Munich signed?

Context articles: 1984–85 FC Bayern Munich season
Dante (footballer)
2017–18 FC Bayern Munich season
2012–13 FC Bayern Munich season
Grünwalder Stadion
FC Bayern Munich
1999–2000 FC Bayern Munich season
Roberto Dias
FC Bayern Munich Junior Team
1987–88 FC Bayern Munich season

The 1984–85 FC Bayern Munich season was the 85th season in the club's history.
 Bayern Munich won its 7th Bundesliga title, reached the semi-final of UEFA Cup Winners' Cup, and finished as runner-up of DFB-Pokal.
 This season was the second season of Udo Lattek's second stint as manager of the club.
 The Bundesliga campaign started 25 August 1984 with a 3-1 victory over Arminia Bielefeld.
 Bayern Munich, 1.
 FC Köln, and Borussia Monchengladbach were tied for first place after Round 1.
 From Round 2 through Round 34 of the season, Bayern Munich were the lone team in first place.
 Qualification for the 1984–85 European Cup Winners' Cup was a result of winning the 1983–84 DFB-Pokal.
Dante Bonfim Costa Santos (born 18 October 1983), commonly known as Dante (] ), is a Brazilian professional footballer who plays for French Ligue 1 club Nice.
 Primarily a central defender, he has previously also been used as a defensive midfielder or a left back.
The 2017–18 FC Bayern Munich season is the 118th season in the football club's history and 53rd consecutive and overall season in the top flight of German football, the Bundesliga, having been promoted from the Regionalliga in 1965.
 Bayern Munich also are participating in this season's edition of the domestic cup, the DFB-Pokal, and the premier continental cup competition, the UEFA Champions League.
 Bayern are the reigning Bundesliga champions, and therefore also are participating in the German super cup, the DFL-Supercup.
 This is the 13th season for Bayern in the Allianz Arena, located in Munich, Bavaria, Germany.
 The season covers a period from 1 July 2017 to 30 June 2018.
The 2012–13 FC Bayern Munich season was the 114th season in the club's history and the 48th consecutive season in the top flight of German football, the Bundesliga, since the promotion of the team from the Regionalliga Süd in 1965.
 Before the start of the season, Bayern signed Xherdan Shaqiri, Dante, Claudio Pizarro, Mitchell Weiser, Tom Starke and Mario Mandžukić.
 Bayern also added holding midfielder Javi Martínez after the first week of the Bundesliga season at the transfer deadline.
 The club started the season with a nine-match winning streak.
 The club would end the season claiming the Treble, winning the Bundesliga, the UEFA Champions League and the DFB-Pokal.
 Bayern are the first German club to achieve the Treble and are the third European Club to complete the Treble in the last five seasons and seventh ever in European Club competition.
Städtisches Stadion an der Grünwalder Straße (also known as "Grünwalder Stadion" and "Sechzger Stadion") is a multi-purpose stadium in Munich, Germany.
 It was built in 1911 and was the home ground for 1860 Munich until 1995.
 Local rival Bayern Munich also played in the stadium from 1926 until 1972, when they moved to the new Olympiastadion.
 Nowadays it is the home ground of the second teams and the (U–19 teams) of Bayern and 1860.
 As of the start of the 2013–14 Bundesliga season, FC Bayern Munich (women) also play their home matches at the ground.
Fußball-Club Bayern München e.V., commonly known as FC Bayern München (] ), FCB, Bayern Munich, or FC Bayern, is a German sports club based in Munich, Bavaria (Bayern), Germany.
 It is best known for its professional football team, which plays in the Bundesliga, the top tier of the German football league system, and is the most successful club in German football history, having won a record 27 national titles and 18 national cups.
The 1999–2000 FC Bayern Munich season was the 100th season in the club's history.
 FC Bayern Munich clinched its second consecutive league title, its third consecutive DFB-Ligapokal championship, and the 1999–2000 DFB-Pokal.
Roberto Dias Branco or simply Roberto Dias (7 January 1943 in São Paulo – 26 September 2007) was a footballer with São Paulo FC in Brazil.
 He was considered by Pelé to be the greatest Brazilian central defender of the 1960s and 1970s.
 He was known for his finesse on defense—a player who didn't need to show a rough side.
 He just knew how to cover and always seemed one step ahead of the forwards he covered—including Pelé.
 Pelé said that Roberto Dias was the only central defender who could truly mark him.
 In one game between Pelé's Santos FC and São Paulo FC in the 1967 edition of the Campeonato Paulista, which ended in a 3–3 draw, Dias, kept Pelé scoreless while scoring 2 goals in the process.
The FC Bayern Munich Junior Team is the youth academy for German football club Bayern Munich.
 The Junior Team was created in 1902 and restructured in 1995.
 It has educated many players who have become regulars in the Bundesliga and Germany.
 The vision for the Junior Team is ""to educate young players so that it will be possible for FCB to keep a global position in club football in the next millennium and its mission is "to have the best youth development in club football.
 Bayern Munich have to test before the school will accept and you can study free until you graduate if you have a talent.""
 Rosters remain unchanged while players train for their position.
 Bayern Munich Junior Team uses a 4–3–3 formation good system.
 Bayern Munich has scouts all over the world.
 Bayern Munich has developed a ""Talent Day"".
 In 2003, Bayern Munich started partnering with other football clubs.
 The penultimate stage for youngsters at Bayern is Bayern Munich II.
The 1987–88 FC Bayern Munich season was the 88th season in the club's history and 23rd season since promotion from Regionalliga Süd in 1965.
 Bayern Munich finished as runner-up in the Bundesliga to SV Werder Bremen.
 The club reached the quarterfinals of both the DFB-Pokal and the European Cup.
 The inaugural DFB-Supercup was won by Bayern Munich over Hamburger SV.
 This season was the first season under manager Jupp Heynckes, who replaced Udo Lattek.