Floors and walls were richly decorated with mosaic and inlay – usually in abstract or floral patterns. The two original double basilicas at Aquileia had both been about 37m by 17m in size, but within 30 years one hall was quadrupled to 73m by 31m. This expanded basilica now demonstrated three additional features that became characteristic of early cathedrals: an enclosure at the eastern end of the church surrounding the altar; a synthronos east of the altar facing west, and consisting of a raised dais with a centrally place bishop's throne and benches either side for the clergy of his familia; and a partitioned-off narthex at the western end into which catechumens would withdraw during the central act of the Eucharistic liturgy.