It is of Muslim origin, from whose time it retains remains in the second inner body.

Its name derives from the Arabic word Bab-Shagra, which means "Puerta de la Sagra".

It was completely rebuilt under the reigns of Carlos V and Felipe II, according to the traces of Alonso de Covarrubias. It is formed by two bodies, between which a weapons square is interspersed.

The monumental outer body is formed by a triumphal arch of padded ashlars, crowned by a huge imperial shield of the city, with its unmistakable double-headed eagle and flanked by two large semicircular masonry towers with the figures of two seated kings, symbol of the good Medieval shield government.

The inner body is a semicircular arch flanked by square towers crowned by spiers of ceramics, in one of whose faces appears the imperial shield of Carlos V, and checkered in others.

The monumental and non-defensive character is evident in the inversion of the embrasures located almost at ground level and embossed ashlars crowning the towers.