e first stone bridge
from the island to the right bank of the river. It is mentioned only
in Not. app. and Pol. Silv. (545), but probably was built soon after the
pons Fabricius. Several Cestii of some prominence are known in this
period, and the bridge was probably constructed by one of them, while
curator viarum, between 62 and 27 B.C.
In the fourth century the pons Cestius was replaced by what was
practically a new structure, which the Emperors Valentinian I, Valens
and Gratian finished in 369 (Sym. Pan. in Grat. p. 332) and dedicated
in 370 as the pons Gratiani. There were two inscriptions recording
this event, each in duplicate, the first cut on marble slabs placed on the
parapet on each side of the bridge, the second beneath the parapet
(CILvi. 1175, 1176). One of the former So also are both the latter (cf. ib. 31250, 31251).
is still in situ. The pons Gratiani
was 48 metres long and 8.20 wide, with one central arch, 23.65 metres
in span, and a small arch on each side, 5.80 met