No one has successfully defended their Champions League title (the closest are Milan - winners 94, runners up 95 - and Juventus - winners 96, runners up 97 and 98). The last team to defend the European Cup was Milan in 1989 and 1990.
Manchester United won the Champions League in 1999 and 2008. They also won the European Cup (the predecesor of the Champions League) in 1968.
Paulo Sousa (Juventus in 1996, Borussia Dortmund - against Juventus - in 1997)
Liverpool have won the UEFA Champions league 5 times. They have won it in the years 1977,1978,1981,1984 and 2005.
Barcelona have won the Champions League 4 times. They have won it in the years - 1992,2006,2009 and 2011.
Champions League: they won in 2006, 2009 and 2011. European Cup: they won in 1992 (the last season before the competition was renamed).
Nottingham Forest won the European Cup, the equivalent of the Champions League, 2 years running - in 1980 and 1981
Liverpool won the Champions League in 1977
Liverpool won the Champions League in 2005.
The team that won the UEFA Champions League in 1984 was Liverpool FC.
They won the European cup in 1968 and the Champions league in 1999.
The team that won the UEFA Champions League in 1975 was Bayern Munchen.
Until the 2011 Champions League, FC Barcelona has won their 4th trophy.