It is one of the few gates of the walled enclosure of the city that have survived to this day. Its original construction has been dated to the Almohad period, probably in the 12th century, and it has been identified with the 'bab al-Qatai' or 'Gate of the Ships', which is mentioned in Muslim sources. This name would come from its proximity to the Almohad shipyards, also built in the 12th century.
The current name already appears in Christian times, in relation to the market and the oil warehouses that were located in the vicinity.
Its current appearance is far from the original and is mostly due to the reform undertaken by Benvenuto Tortello in the 16th century, focused on facilitating vehicle traffic through the shutter.
Also from the 16th century seems to be the monumental shield of Seville that is located on the opening towards the center of the city. It has been attributed to the Renaissance sculptor Juan Bautista Vázquez el Viejo.
Next to the Postigo is the small Chapel of La Pura y Limpia, built in the 18th century. There a small image of the Immaculate attributed to Pedro Roldán is venerated.