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the name ordinarily given to a four-way arch of marble, which stands directly over the cloaca Maxima, and probably marked the line of separation between the forum Boarium and the Velabrum. It consists of four piers connected by quadripartite vaulting, and is 12 metres square and 16 high. The arches themselves are 10.60 metres high and 5.70 wide. Round all four sides run two rows of niches for statues, forty-eight in all, of which sixteen are unfinished. The keystones of the arches were sculptured, and the figures of Minerva and Roma are still visible on the north and east sides. The structure is of late date, third or fourth century,1 and may perhaps be identified with the arcus divi Constantini in Region XI (Not., om. Cur.; DAP 2. vi. 261; Jord. i. 2. 471). For a detailed description of this arch, see PAS ii. 80; Toeb. i. 131-135; ZA 258-261 ; for illustrations, Baumeister, Denkm. iii. pl. Ixxx. 6, lxxxi. 8; Canina, Edifizi, iv. 253. Cf. ASA 119.

Hulsen points out (Toeb. cit.) that the superstructure, which was removed in 1827 as mediaeval, probably belonged to the attic (DuP. pi. 23, fig. 38 and pp. 74, 75); and reconstructs it with a pyramid on top.

1 It is attributed to a period a little before Diocletian in Zeitschr. f. Gesch. d. Archit. viii. (1924), 74, as against the attribution to the second third of the fourth century in Toeb.

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