The fourth period covers the earlier decades of the Roman colony, from 80 B.C. to near the end of the Republic. According to inscriptions which are still extant, soon after the year 80 a wealthy colonist, Gaius Quinctius Valgus, when duumvir with Marcus Porcius as colleague, built the Small Theatre, and afterwards, when quinquennial duumvir with the same colleague, the Amphitheatre also. Both structures have the quasi-reticulate facing (Fig. 11); and several other buildings in which the same style of masonry is found without doubt belong to the same period--the Baths near the Forum, the temple of Zeus Milichius, a building just inside the Porta Marina, and apparently the hall at the southeast corner of the Forum, which we shall identify as the Comitium; with these should be included also the original temple of Isis, which was destroyed by the earthquake of 63 A.D. Few houses dating from this period have been discovered; the provision made by the preceding period in this respect had been so generous that new houses were not needed. From the aesthetic point of view the fourth period falls far below that just preceding; the exhaustion of resources and the decline of taste due to the long and terrible war are unmistakable. Theatre, Amphitheatre, and Baths were alike built for immediate use, with crude and scanty ornamentation; and where richer ornament was applied, as in the case of the temple of Isis, it could not for a moment be compared with that of the Tufa Period in beauty and finish. [Illustration: Fig. 11.--Quasi-reticulate facing, with brick corner, at the entrance of the Small Theatre.] The wall decoration of the fourth period is of the second Pompeian style, which came into vogue just after the founding of the colony, and which we shall call the Architectural Style; for in part, as the first style, it imitated a veneering of marble, not however with the help of slabs or panels modelled in stucco, but by the use of color only, laid on walls finished to a plane surface; in part it made use of architectural designs which were painted either correctly or with at least some regard for proper proportions.