The Greek author Plutarchus (c. 46-127 AD) was procurator of Achaea under Hadrian. He is best known for his Parallel Lives, biographies of eminent Greeks and Romans, composed in pairs.

Parallel Lives, Caesar 58, 10
In the midst of the Parthian expedition he was preparing to cut through the isthmus of Corinth, and had put Anienus in charge of the work. He also proposed to divert the Tiber immediately below Rome by a deep canal which was to run round to the Circaean promontory and be led into the sea at Terracina. By this means he would provide a safe and easy passage for traders bound for Rome. In addition he proposed to drain the marshes by Pometia and Setia and so provide productive land for thousands of men. In the sea nearest Rome he intended to enclose the sea by building moles, and to dredge the hidden shoals off the coast of Ostia, which were dangerous. So he would provide harbours and anchorages to match the great volume of shipping. These schemes were being prepared.

Translation: R. Meiggs, Roman Ostia, p. 53.