Flenio
Flenio a place which the Table fixes on a road from Noviomagus (Nymegen) to Lugdunum (Leiden). The next station to Lugdunum is Forum Hadriani (Voorburg); and the next station to Forum Hadriani is Flenio. The distance between Forum Hadriani and Flenio is 12 M. P. D'Anville fixes Flenium at Vlaardingen on the Maas. This place was probably the chief town on the river in the Roman time, as it was certainly for a long time after, and before the rise of Rotterdam, which is not mentioned until the 14th century. D'Anville establishes the fact of Flenio being the centre of some road by the evidence of a milestone which was dug up at a place called Monster near s'Gravesande, with the number XII. upon it, a distance which fits no place except Vlaardingen. The distances in this part of Gallia are in Roman miles.
From William Smith (ed.), Dictionary of Greek and Roman Geography. Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities and Tufts University. Data accessed from https://github.com/PerseusDL/canonical-pdlrefwk/ on 17 October 2026.