[1] The first references to football in Mataró can be found in 1901, when members of the Sociedad Colombófila Mensajera Iluro, based in the Sport Mataronés building, began to play inside the local velodrome wearing a red and white striped t-shirt.

[3] These two teams, Iluro and Mataróní, played a few matches throughout the 1910s, but football did not begin to be organized in earnest until the following decade, driven by the students of Escolapis and Valldemia schools.

[3] With the new National Shooting Range located on the Paseo de Rocafonda used by Sport Mataronés, which was just a few hundred meters away from Campo de Fomento, Iluro SC soon gained more and more followers, until having enough to not only hold second and third teams, but also to beat Mataró FC in their intense duels, a power struggle that continued until the summer of 1915 when Mataró FC, poorly managed and with continuous changes of directors, ended up folding and disappearing.

[1] With hardly any opposition in the town, the club had no activity for a long time, and in 1917, the board of directors of Iluro SC demanded to use Campo de Fomento as it was better conditioned for football practice, an request that was approved and then celebrated on 8 July, inviting FC Barcelona with whom they lost 0–1.

[3][8] The club debuted in 1924–25 with a magnificent second place after CD Júpiter from Barcelona, thus establishing themselves in this category, being fifth in the 1925–26 edition and seventh in the following year 1926–27 to be fourth in the season 1927–28 in times where professionalism, regularized by the Catalan Federation since 1925, meant the disappearance of CD Mataró, who could not survive such a harsh and demanding economic regime, leaving Iluro as the only banner Mataronense at the federated level.