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Classical Topography of the Roman Campagna—III. 41.

is not indicated in the plan in Codex Vaticanus i960 (De Rossi, Piante
icnografiche e prospettiche di Roma anteriori al secolo X V, tav. i), which dates
from a period previous to Nicholas III (1277). It had already been closed
by the time of Eugenius IV (1431-47), when Biondo da Forli wrote his
Roma Ristaurata (cf. the 1558 ed. p. 5V), and we also see it closed in the
plan of Rome in Codex Vaticanus Urbinas, 277, which belongs to about the
time of Nicholas V (De Rossi, op. cit. tav. iii, where it is called P(orta)
metromi [sic] murata). In 1534 Marliani, Antiquae Romae Topographia
i8v wrote Gabiusa {porta}, quae in angulo murorum sub Caeliolo occurrit,
sed clausa: per quam ingreditur rivus aquae nunc Marianae. Gabiusae
autem obtinuit nomen q{uod} recta in Gabios oppidzim, nunc Galicamtm,
mitteret. Metrodii deinde porta a mensura est dicta.
Fulvio (ed. 1543, 2iv) points out the error of calling the Porta
Metroni the Porta Gabina or Gabiusa, ‘perche la porta Gabiusa seguitaua
incontanete dopo la Collatina ’ (which, however, he wrongly identifies with the
Porta Pinciana, isv),
Parker {Aqueducts, Diagrams pl. XIV) wrongly attributes to the early
Empire the arch under the Aurelian wall by which the Marrana enters the
city at the Porta Metroni. The stream itself, which will be dealt with
later, was brought into Rome by Calixtus II in 1122: cf. Lanciani,
Comentari di Frontino in Memorie dei Lincei, Ser. iii. vol. iv. (1880) 325
seq. Tomassetti, Bull. Com. 1893, 65 seq. follows Fabretti {de Aquis (1788)
143) in holding that this stream dates from the classical period. In this,
however, he is wrong : for while it is true that the tunnel by which it
passes through the hill to the N. W. of Centroni {infra, 118), is not, as
Lanciani says, of mediaeval, but of classical origin, this tunnel was made,
not for it, but for the Aqua Claudia {Classical Review, 1900, 327), and it
has very likely appropriated the specus of this aqueduct between the
Casalotto and Casale Bertone, near the station of Capannelle.
The district both inside and outside the gate was low and marshy,
{infra, 43) and bore, in the late classical period, at any rate, the name of
Decennium orDecenniae: see C.I.L. vi. 31893, a fragmentary inscription of
about 370 A.D. containing an edict of the praefectus urbi in regard to
fraudulent practices committed by certain tradesmen. Previous to the
discovery of this inscription the name was considered to be of mediaeval
origin (Tomassetti, 17) being first mentioned in a document of 857 A.D.
{Reg. Subl. no. 87 ed. Allodi-Levi, p. 132).
 
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