A massive rectangular foundation was uncovered south of the Roman Temple of Claudius (Insula 22), comprised of rough stones and mortar. It lay below Roman surface level, and was clearly only a foundation. The northern edge had a well defined rough face, the eastern looked as if a similar face had been robbed. It lay 15ft 6" from the centre line of the Roman drain to the north and 14ft 6" from the line of the drain on the east. The feature was presumed to be part of a Roman altar base.<1>

Hull (1958, p.176) describes the possible altar: 'the NE. angle of a massive rectangular foundation of rough stones and mortar (T). It lay below Roman surface-level, and was clearly only a foundation. The northern edge had a well-defined rough face, the eastern looked as if a similar outer facing had been robbed. It lay 15 ft. 6 in. from the centre line of the drain on the north, and 14 ft. 6 in. from that of the drain on the east. If symmetrically placed it must have been about 33 ft. E.-W.; the other dimension remains unknown'.<1>