This is one of the oldest gates in the Wall, although it has undergone subsequent reforms. These were the kind of gates known by the Romans as posterulae, exclusively used for military purposes that were cut open asymetrically on the wall between two towers. Then they dug trenches under the archway. This gate was presumably closed during the Middle Ages and was re-opened in the XVII century when the Hospital of St. Bartholomew was taken from Praza Maior to its new location in the nearby Ferrol Sq. Couriers came and went through this gate (for a long time it was the shortest way into the road to Corunna, that housed the headquarters of the Regional Government and Courts.
It is well into the XX century when vehicles are barred and steps are built through the archway.
It is placed on a slope; it is 3.45 metres wide, the keystone 5,65 metres high, and the total height 11.50 metres.
Through this gate, there is a staircase to the walk on top, on the left hand side.