The so-called Temple of Demeter (the remains of which are located below of the church of San Biagio) can be dated between 480 and 470 BCE. This temple offers an interesting example of distylous building in antis, i.e.without an outer colonnade. It has a simple cella preceded by a pronaos (ante-room) with two columns.
Still preserved from the original structure are the base (30 by 13 m approx and partly visible), the outer cella walls and the wall between the cella and the pronaos. These remaing parts have been incorporated in the medieval church dedicated to St. Biagio. The beautiful water spouts in the shape of lion’s heads from this building can still be seen in the Regional Archaeological Museum of Agrigento in the room dedicated to architectural sculptures.
The Temple of Demeter in the classical period was part of a temenos, a sacred enclosure that included other adjacent structures, such as two small round altars with a central bothros or holy well. Inside, archaeologists found kernoi (ritual vessels linked to the cult of Persephone) and the remains of busts that must have represented Demeter.
References:The Church of St Donatus name refers to Donatus of Zadar, who began construction on this church in the 9th century and ended it on the northeastern part of the Roman forum. It is the largest Pre-Romanesque building in Croatia.
The beginning of the building of the church was placed to the second half of the 8th century, and it is supposed to have been completed in the 9th century. The Zadar bishop and diplomat Donat (8th and 9th centuries) is credited with the building of the church. He led the representations of the Dalmatian cities to Constantinople and Charles the Great, which is why this church bears slight resemblance to Charlemagne's court chapels, especially the one in Aachen, and also to the Basilica of San Vitale in Ravenna. It belongs to the Pre-Romanesque architectural period.
The circular church, formerly domed, is 27 m high and is characterised by simplicity and technical primitivism.