Strabo (60 BC - 23 AD)
Geographica, V. 6, 7
The harbour, like the river, is called Medoacus. The largest city in the marshes, however, is Ravenna, a city built entirely of wood and coursed by rivers, and it is provided with thoroughfares by means of bridges and ferries. At the tides the city receives no small portion of the sea, so that, since the filth is all washed out by these as well as the rivers, the city is relieved of foul air.