Ajax is historically one of the most successful clubs in the world; according to the IFFHS, Ajax were the seventh most successful European club of the 20th century.The club is one of the five teams that has earned the right to keep the European Cup and to wear a multiple-winner badge; they won consecutively in 1971–1973. In 1972, they completed the European treble by winning the Dutch Eredivisie, KNVB Cup, and the European Cup; to date, they are the only team to keep the European Cup and accomplish the European treble.