This spectacular basilica comes from the 4th century and was built on the initiative of Bishop Theodore. This first church consisted of two parallel chambers (and one that connected), as well as other rooms and the baptistery, which is still preserved. Subsequently, this first building suffered various modifications over the centuries, such as the plant changing by a cross, or the construction of a crypt under the chancel. It was the seat of the Patriarchate of Aquileia, which played an important role in the history of the area. The first thing a visitor will see when entering the basilica are the mosaics that cover the entire floor of the nave and aisles, and the magnificent frescoes. The basilica is blessed with great light, for that reason, we get a great look at the frescoes and the mosaics. The mosaics actually form the oldest part of the Christian West. This basilica, along with the archaeological site of Aquileia, actually have been declared World Heritage Sites by UNESCO World Heritage. This is definitely one of my favorite spots I have been to in the entire country of ITaly.