The temples of Sant Pere, Sant Miquel and Santa María, which originally formed the Paleolithic "cathedral" in Egara, have undergone multiple stages of construction that have left their mark in a variety of styles, -from late Roman to Gothic styles- and artistic disciplines. It is, therefore, a monument unique to Catalonia.

The first building is a paleochristian complex that served as the bishopric of Egara, of which there are still vestiges of the temples of Santa Maria and Sant Miquel. The fact that there are three churches has historically been interpreted as a "copy" of the ancient Byzantine model -two churches and a baptistery- but after recent excavations (2000-2007), scholars think that the church of Sant Miquel was not used as a baptistery, but rather that it had a funerary use. Therefore, we find ourselves in a paleochristian cathedral, set out as a miniature city with several outbuildings and temples.

The second stage of construction dates back to the ninth and tenth centuries following the Christian conquest of the territory dominated by the Muslims. Therefore, the style is Pre-Romanesque; there are many signs of this era in the churches that were eventually finished in the third and final stage, by this time the Romanesque (11th-12th centuries).