This stone entryway, which opens onto the southern arm of the transept and faces the Plaza del Rey San Fernando, was constructed between 1230 and 1240 and is less well-known than the more famous Puerta Sacramental. It features one of Spain's most impressive collections of Gothic sculpture from the 13th century. Despite its modern aesthetic approach, it is devoted to the ancient subject of Christ as King.

The tympanum is the masterpiece of the structure and is credited to the French artist known as the Master of the Beau Dieu of Amiens. The sculpture of Amiens Cathedral had an evident impact on the design of the magnificent gateway in Burgos. Jesus is seated as a Pantocrator, displaying the Book of the Law, and the Four Evangelists surround him in this nearly triangular space, symbolized both iconographically by the Evangelists' postures as they write the Gospels and symbolically by the Tetramorphos. A lone sage, a lone sage, a lone sage, a lone sage, a lone sage. Three archivolts surround the tympanum, and within them are depictions of the 24 elders of the Apocalypse, who are shown either playing or tuning medieval musical instruments, as well as a number of angelic choirs and an allegory of the arts. Local sculptors likely worked under the tutelage of French masters to create this iconographic ensemble.

A modern statue (replacing the deteriorated original, which may also have been carved by the Master of Sarmental) depicting a bishop stands in the mullion separating the two halves of the door; the depicted individual is commonly known as Maurice, but it could just as easily be Asterius or Saint Indaletius, the first bishop of Almera, martyr, and Christianizer of the lands of Burgos. Later than the rest of the entryway, four sculptures representing Moses, Aaron, St. Peter, and St. Paul are sculpted on the side jambs. The other two figures are less clear.

While the front is where most of the attention is focused, the gable's buttresses and pinnacles can't be ignored. It was written at the tail end of the 13th century, making it a late medieval piece. Its two upper sections are occupied by a rose window and, above it, an open gallery with three arches with openwork intradoses with triple quatrefoils and supported by mullions, in front of which a statuary interpreted as the Divine Liturgy appears, with Christ administering the Eucharist flanked by twelve ceriferary and turiferary angels.

These days, visitors typically use the Puerta del Sarmental (Sarmental Gate) to access the Cathedral.