The Porta Cristina was built, as an extension of the ancient Porto Soccorso, in 1825. Its function was to connect the Castello district with the esplanade to the west of the Citadel.
The designer, Carlo Pio Boyl of Putifigari, commander of the Royal Military Arsenal, took the Roman Porta Angelica as a model, imprinting on it a military architectural taste typical of his time, with references to neoclassical culture.
The work was dedicated to Queen Maria Christina of Bourbon, wife of King Charles Felix, as also reflected in the inscription inserted in the lunette of the facade created by Domenico Franco. Adjacent to the Gate are two bodies of buildings that incorporate the ancient curtain wall of St. Pancras; they were built starting in 1830, after the execution of the Gate itself. In the body to the south, and partially incorporated into the Palazzo delle Seziate, is a circular tower, brought to light during recent restorations. It is documented as early as the end of the 14th century together with its so-called Franca twin, overlooking the Via Fiume of circular layout, made of stone blocks.
In 1553, at the behest of architect Rocco Cappellino its height was reduced to prevent it from being an easy target for enemy artillery. In 1688, during the construction of the Palazzo delle Seziate, it was decided to incorporate it inside the new building.
