
Aquileia is an ancient Roman city in what is now Italy. Today, it is the main archeological site of Northern Italy.
The Cathedral of Aquileia is one of the most important edifices of Christianity. It is a flat-roofed basilica erected by Patriarch Poppo in 1031 on the site of an earlier church, and rebuilt about 1379 in the Gothic style by Patriarch Marquad.
The façade, in Romanesque-Gothic style, is connected by a portico to the Church of the Pagans, and the remains of the 5th century Baptistry. The interior has a nave and two aisles, with a noteworthy mosaic pavement from the 4th century. The wooden ceiling is from 1526, while the fresco decoration belongs to various ages: from the 4th century in the St. Peter's chapel of the apse area; from the 11th century in the apse itself; from the 12th century in the so-called "Crypt of the Frescoes", under the presbytery, with a cycle depicting the origins of Christianity in Aquileia and the history of St. Hermagoras, first bishop of the city.
Next to the 11th century Romanesque chapel of the Holy Sepulchre, at the beginning of the left aisle, flooring of different ages can be seen: the lowest is from a Roman villa of the age of Augustus; the middle one has a typical cocciopesto pavemente; the upper one, bearing blackening from the Attila's fire, has geometrical decorations. Externally, behind the 9th century campanile and the apse, is the Cemetery of the Fallen, where ten unnamed soldiers of World War I are buried. Saint Hermangoras is also buried there.