Question: The 2014–15 UEFA Champions League knockout phase lead to the final of the 23rd season since it was renamed from what?

Context:
2014–15 UEFA Europa League knockout phase
The 2014–15 UEFA Europa League knockout phase began on 19 February and concluded on 27 May 2015 with the final at Stadion Narodowy in Warsaw, Poland to decide the champions of the 2014–15 UEFA Europa League.
 A total of 32 teams competed in the knockout phase.
2017–18 UEFA Youth League knockout phase
The 2017–18 UEFA Youth League knockout phase (play-offs and round of 16 onwards) will begin on 6 February 2018 and conclude on 23 April 2018 with the final at Colovray Stadium in Nyon, Switzerland, to decide the champions of the 2017–18 UEFA Youth League.
 A total of 24 teams compete in the knockout phase.
2014–15 UEFA Champions League knockout phase
The 2014–15 UEFA Champions League knockout phase began on 17 February and concluded on 6 June 2015 with the final at Olympiastadion in Berlin, Germany to decide the champions of the 2014–15 UEFA Champions League.
 A total of 16 teams competed in the knockout phase.
2015–16 UEFA Champions League knockout phase
The 2015–16 UEFA Champions League knockout phase began on 16 February and concluded on 28 May 2016 with the final at San Siro in Milan, Italy, to decide the champions of the 2015–16 UEFA Champions League.
 A total of 16 teams competed in the knockout phase.
2015 UEFA Champions League Final
The 2015 UEFA Champions League Final was the final match of the 2014–15 UEFA Champions League, the 60th season of Europe's premier club football tournament organised by UEFA, and the 23rd season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League.
 It was played at the Olympiastadion in Berlin, Germany, on 6 June 2015, between Italian side Juventus and Spanish side Barcelona.
2000–01 UEFA Champions League
The 2000–01 UEFA Champions League was the 46th season of the UEFA Champions League, UEFA's premier European club football tournament, and the ninth since it was rebranded from the "European Champion Clubs' Cup" or "European Cup".
 The competition was won by Bayern Munich (first title since 1976), who beat Valencia 5–4 on penalties after a 1–1 draw after extra time.
 It was their first UEFA Champions League title, and their fourth European Cup title overall, it was Valencia's second consecutive final defeat, losing to Real Madrid in the previous season.
 The knockout phase saw Bayern eliminate the preceding two Champions League winners, Manchester United and Real Madrid, winning all four games in the process.
 Valencia, meanwhile, defeated English sides Arsenal and Leeds United in the knockout phase en route to the final.
2016–17 UEFA Champions League knockout phase
The 2016–17 UEFA Champions League knockout phase began on 14 February and ended on 3 June 2017 with the final at Millennium Stadium in Cardiff, Wales, to decide the champions of the 2016–17 UEFA Champions League.
 A total of 16 teams competed in the knockout phase.
2017–18 UEFA Champions League knockout phase
The 2017–18 UEFA Champions League knockout phase will begin on 13 February and end on 26 May 2018 with the final at the NSC Olimpiyskiy Stadium in Kiev, Ukraine, to decide the champions of the 2017–18 UEFA Champions League.
 A total of 16 teams compete in the knockout phase.
2014–15 UEFA Champions League group stage
The 2014–15 UEFA Champions League group stage was played from 16 September to 10 December 2014.
 A total of 32 teams competed in the group stage to decide the 16 places in the knockout phase of the 2014–15 UEFA Champions League.
2014–15 UEFA Champions League
The 2014–15 UEFA Champions League was the 60th season of Europe's premier club football tournament organised by UEFA, and the 23rd season since it was renamed from the European Champion Clubs' Cup to the UEFA Champions League.

Answer: European Champion Clubs' Cup