The league hosts three of the world's most famous clubs as Juventus, Milan and Internazionale, all founding members of the G-14, a group which represented the largest and most prestigious European football clubs from 2000 to 2008, with the first two also being founding members of its successive organisation, European Club Association (ECA). More players have won the coveted Ballon d'Or award while playing at a Serie A club than any league in the world other than Spain's La Liga, although Spain's La Liga has the highest total number of Ballon d'Or winners. Juventus, Italy's most successful club of the 20th century and the most successful Italian team, is tied for sixth in Europe and twelfth in the world with the most official international titles. The club is also the only one in the world to have won all possible official confederation competitions.</ref> Milan is joint third club for official international titles won in the world, with 18. Internazionale, following their achievements in the 2009–10 season, became the first Italian team to have achieved a treble. Inter are also the only team in Italian football history to have never been relegated. Juventus, Milan and Inter, along with Lazio, Fiorentina, Roma and Napoli, are known as the Seven Sisters of Italian football.