In 1948 the three leagues running Division 3 (Serie C) had to be reorganized due to an ever-growing number of regional teams. FIGC decided not to relegate the excess teams to regional championships. It chose the winners and a few runners-up from the 36 Serie C championships to be added to the new third division set up into 4 groups. The rest of the teams joined the new
Promozione, which changed its name in 1952 into
IV Serie (Fourth Division) and then in 1959 into
Serie D. From 1959 each player in the Serie D championships had to opt for semi-professional status, by signing a specially issued status attribution form. The championship was thus included in the
Lega Nazionale Semiprofessionisti, today known as
Lega Pro. Serie D was re-organized in 1981 when championships were reduced. The league name changed into the
Interregional. Players lost semi-pro status and converted to amateurs. The championship subsequently passed into the
Lega Nazionale Dilettanti. From 1992 to 1999 the name changed into
Campionato Nazionale Dilettanti before eventually returning to the current
Serie D name. With the merger of the Lega Pro's two divisions at the end of the 2013–14 season to reestablish the Serie C, Serie D and the leagues below it moved up by one level in the pyramid system, reducing the number of leagues in Italian football to nine. ==Structure==