The Quadruple is a term that is used in football to denote a football club winning four different competitions in the same season. It is said to be a huge honour to ‘do the quadruple’.
The four different competitions are usually the domestic league, the two most important club competitions and a continental competition. It is not easy at all to achieve this feat but Scottish giants Celtic managed to do just that in the 1966-1967 when they won the Scottish First Division, the Scottish Cup, the Scottish League Cup and the European Cup.