Football
Serie A history
How the competition came to look the way it does.
Twenty clubs, thirty-eight matchdays
Italian football organised its national championship early and the modern single-division format replaced a regional structure that had decided titles through playoff rounds.
The competition's identity has long been tied to defensive organisation, though the tactical picture has shifted repeatedly and is far less uniform than the label suggests.
Promotion and relegation have been continuous, which keeps the bottom of the table as consequential as the top.
Season-by-season champions, records and historical tables need a licensed historical data source. Until we have one, this page carries written history only.