The cella of the temple of Heracles underwent considerable modifications in Roman times, and the discovery in it of a statue of Asclepius seems to show that the cult of this deity superseded the original one.
To the south-west of the Forum are the remains of three small temples, one dedicated to Venus, and a well-preserved Mithraeum, with mosaics representing the seven planets, &c. To the south-west again is the conspicuous brick cella of a lofty temple, on arched substructures, generally supposed to be that of Vulcan, with a threshold block of africano (Euboean) marble over 15 ft.
The plan of the temple is chiefly remarkable for the unsymmetrically placed door leading from the back of the cella into the opisthodomus.
In all the large temples the cella is divided into two parts, the smaller and inner of which (the adytum) was intended for the cult image.
Matthew edited anew the works of Abbot John de Cella and Roger of Wendover, which in their altered form constitute the first part of his most important work, the Chronica majora.