An event in which a football team wins three competitions within their continent in a single season. In over a hundred years of football history, it has only happened twelve times. The most notable winners were Celtic FC in 1967 when they not only won a treble but a quadruple.
Person 1: FC Barcelona won a continental treble in 2009?
Person 2: Yeah! They won La Liga, the Champion's League, and the Copa del Rey!