The gate was built about 1600 and designed by Bernardo Morando. The passage has a tunnel vault and embrasures in the walls, which were used for observation and shooting. Masonry finial of the facade is decorated with a low relief featuring the patron saint of the town, St. Thomas with Christ Arisen. On both sides there are cartouches with three crossed spears, i.e. the coat of arms of the Zamoyski family called “Jelita”. An inscription in Latin, situated under the low-relief reads: “Winner of sin, hell and death repel fierce attacks of all our enemies” and another inscription situated below reads: “In the year of Our Lord 1580 the Great Chancellor of the Polish Kingdom started to fortify this place and collect settlers here and gave it the name of ‘Nowy Zamość’.
Next to the gate there is Łukasiński’s prison cell with a tablet commemorating Walerian Łukasiński, the founder of National Masonry and Patriotic Society, who was kept prisoner in Zamość fortress from 1824 till 1825
