Finnea, whose Irish name Fiodh an Átha means the wood of the ford, grew up around a river crossing of considerable strategic importance, and the ordinary-looking ground underfoot was once the main medieval routeway linking two provinces across the Inny River.

The settlement that preceded the modern village was a cluster of dwellings ranged on either side of that routeway, funnelling travellers towards the bridge and ford over the Inny. A medieval castle guarded this crossing, and by the seventeenth century an artillery fort had been added to the west of the village, reflecting the continued military value of the point. The layout of the place is not a matter of guesswork: a 1657 Down Survey map of Fore Barony shows the ruinous tower or castle standing in a field to the north of the road crossing the bridge, with dwellings clustered along the road on both sides. The Down Survey was a mid-seventeenth-century mapping project that recorded land ownership and settlement across Ireland, and this particular sheet preserves a snapshot of Finnea at a moment when its medieval fabric was already beginning to decay. The settlement's significance was rooted in its position on the boundary of the Anglo-Norman lordship of Meath, making the ford not merely a convenience for travellers but a politically charged threshold between two very different administrative worlds.

Visitors crossing the bridge today are, in effect, following a line of movement that has been in use since at least the medieval period, passing over the same river at more or less the same point where the castle once stood watch.