Constantine is said to have erected a church at Antioch which, from the description given by Eusebius, was octagonal in plan.
On Mount Gerizim, on or near the site of the Samaritan temple, Justinian built an octagonal church showing in its multifold chapels a considerable advance towards Christian arrangements; it has, however been so completely destroyed that only its foundation can now be traced, from which the plan (Woodcut No. [296]) was measured and worked out by Sir Charles Wilson.
296. Church on Mount Gerizim.
297. Cathedral at Bosra. Scale 100 ft. to 1 in.
At Bosra in the Hauran there is a church of perfectly well-ascertained date—A.D. 512—which, when more completely illustrated, will throw considerable light on the steps by which a Pagan temple was transformed into a Christian church. It is a building externally square, but internally circular (Woodcut No. [297]). The central space is 91 ft. in diameter, and was evidently covered with a wooden roof, according to M. de Vogüé, supported on eight piers. The interest of the plan consists in its showing the progress made in adapting this form to Christian purposes, and it is to be hoped that further investigation may enable us to supply all the steps by which the transformation took place. De Vogüé is of opinion that there was a central dome carried on piers and columns similar to the church of SS. Sergius and Bacchus in Constantinople, with aisles round and gallery over them, the latter covered with a timber roof, the holes in which the rafters were fixed being still visible. Owing to want of lateral support the dome fell down, and at a later period a small basilica church was erected within the enclosure in front of the apse; the proximity of the piers of this church suggests that it was covered with stone slabs according to the custom of the country. The inscription over the principal entrance door states that the church was dedicated to SS. Sergius and Bacchus, and was completed in the 400th year of Bosra (511-512 A.D.). Another example exists at Kalat Sema’n, in Northern Syria, and presents a combination of an octagonal with a rectangular church very common in Armenia and Georgia. As is generally the case there, they are very small in dimensions, the whole group only measuring 120 ft. by 73. Their actual destination is not known, but M. de Vogüé suggests that the triapsal arrangement in the octagonal building points to its having been erected as a baptistery. This group is situated about 200 yards from the main buildings illustrated in Woodcut (No. [280]).
298. Section of Double Church at Kalat Sema’n. (From De Vogüé.) Scale 50 ft. to 1 in.
