Samuel Ball Platner, Thomas Ashby, A Topographical Dictionary of Ancient Rome

FORNIX AUGUSTI

* probably an arch at the head of the pons Aemilius, remains of which and an inscription (CIL vi. 878) are reported to have been found in the fourteenth century. This inscription merely records a restoration by Augustus after 12 B.C. In 1551 two other inscriptions (CIL vi. 897, 898) to Gaius and Lucius Caesar were found near the temple of Fortuna Virilis, which may have belonged to the arch (LS iii. 39; Jord. i. 2. 485).

See BC 1924, 229-235; RAP iii. 179; Mitt. 1925, 337, 349, 350, for an identification with the ARCUS STILLANS (q.v.) and for a theory that it was an arch of a branch aqueduct of the Aqua Claudia (not the Marcia, as is wrongly state;) across the river (Frontinus, de aquis, i. 20; modum quem acceperunt (arcus Neroniani) aut circum ipsum montem (Caelium) aut in Palatium Aventinumque et regionem Transtiberinam dimittunt).