The Cathedral of Ancona, also known as San Ciriaco, is the main Church of Ancona, the capital city of the Italian region of Marche. The Cathedral is dedicated to Judas Cyriacus, which is evident from the title.

The building of the Cathedral, located on the guasco hill, which towers over the Ancona and the Gulf, is an example of mixing the Romano-Byzantine and Gothic styles. It stands on the site of an ancient Greek Acropolis. Excavations carried out here in 1948 year, found that around the 3rd century BC on the site of the present Cathedral was a temple, probably dedicated to Aphrodite. In the 6th century BC and on its place was built the early Christian Church, which had a Central nave and three side chapels. The entrance to the Church was from the South-East side, where today is located the Chapel of the Crucifixion. To this day preserved some fragments of the early Christian churches, such as mosaic floors and external walls.

In 995-1015-m, on the Foundation of the old Church was built in 1017, the year transferred the relics of saints Marcellinus Ancon and Judas Cyriacus. 12-13-th centuries the Cathedral made an addition that gave it the form of a Greek cross. Then the Church, formerly bore the name of San Lorenzo, was pereosviashchena in honor of St. Judas Cyriacus, the patron Saint of Ancona and the first Bishop of the city.

The first restoration work in the Cathedral was held in 1883. During the First World war, the Basilica was seriously damaged during the bombing, and was only restored in 1920, the year. And during the Second World war during an air RAID on the city were destroyed by the transept and the crypt of the Church together with kept them in works of art. Another serious damage to the building was awarded in 1972, the year during an earthquake, and was reopened to the public in 1977.

Today the white-stone Cathedral of San Ciriaco is one of the main attractions of Ancona. Its outer walls are decorated with false arched openings. The bell tower stands at some distance from the Church. It was built in the 14th century on the site of a former bell tower. The façade is divided into three sections, preceded by a wide staircase, which rests in the Romanesque portal of the 13th century. The latter is a round arch with four columns. Stand in front of the lions, made of red Verona marble, and the rear, added Luigi Vanvitelli, on simple pedestals. It is believed that the portal is the creation of Giorgio da Como.

Notable is the dome of the Cathedral is one of the oldest in Italy. It has a somewhat conical shape with twelve faces. The dome was made in the 13th century by Margaritone d Arezzo. The copper coating was added in the 16th century.

Inside the wooden arches of the nave are decorated with paintings from the 15th century. The left side of the cloister you can see the monument to the warrior Fermo 1530 year. In the right transept is the chapel of the Crucifix, decorated with images of saints, God the father, the virgin Mary and figures of animals. In the crypt beneath the chapel and restored after the Second World war, fragments of the ancient Church. And in the left transept was built the chapel of the Madonna with richly decorated niche in which is stored the most revered icon of the virgin Mary. Beneath this chapel is another crypt – it stores the relics of St. Judas Cyriacus in a marble crypt), saints Liberia and Marcellinus (in cancer of Sicilian Jasper) and the dust of the Holy Palatii.