Cultural y Deportiva Leonesa B was born from the team Jupiter Leonés, founded in 1929 and originally wearing a red or claret t-shirt and black pants.

As the club was achieving great success, President Antonio Amilivia began the first contacts to merge Júpiter and Deportivo.

With the descent to Tercera de la Cultural in 1958 the agreement broke down and during the 60s they became legally different clubs, although for all the soccer people the union continued.

The lineup of Carlos, Pin, Tobi, Roberto, Paquito, Raúl, Cacharrón, Javi, Losada, Canseco and Pachi will be remembered.

After the season 2009–10, the reserve team was dissolved as Cultural Leonesa was relegated to Tercera División due to its financial trouble.

With the entering of the Qatari Aspire Academy in the board of Cultural Leonesa, the intention was to promote Júpiter to Tercera División immediately.