Abstract
The basilica of the Faculty of Medicine plot at Knossos in Crete (beginning of 5th c.) and that of Antigoneia in Albania (end of 6th - beginning of 7th c.) constitute up to now two isolated examples in Eastern Illyricum, of churches whose sanctuary is in the form of a triconch added at the east of the naves. The study of these two edifices throws light on their differences and similarities, both architectural and functional; on the other hand a comparison with other churches in the Mediterranean basin shows that they belong to a particular type, whose origin may be found in certain funerary monuments at Rome and the regions under its influence. We consider the choice of this particular type of sanctuary, the place above all where the mystery of the Eucharist is performed simulating the Last Supper celebrated in the "stage piece" at Jerusalem. If the trefoil plan is derived from the funerary edifices where funerary banquets and repasts in honour of the martyrs were performed, it is equally related to the triconch triclinia of the wealthy residences found particularly in the western part of the Roman Empire. Lastly, the mosaic paving in the Antigoneia church, whose decoration reflects a theological preoccupation that also occurs in the murals and the pavements of other trefoil sanctuaries, suggests that the lateral apses probably had functions similar to those described by Saint Paulin of Nola.