But in 1013, before the city had grown to swallow the landscape, one particular crossing point on this river was significant enough to be recorded by name. A historian working with early medieval sources, H.B. Clarke, noted in 2002 a fording point referred to as the 'ford of the rock', citing a reference that places it in the year 1013. A ford, simply enough, was a shallow stretch of river where people and animals could cross on foot without a bridge, and in a period when bridges were scarce and rivers were genuine obstacles, such crossings became landmarks in their own right, often giving names to settlements and routes that persisted for centuries.

The year 1013 is a charged moment in Irish history, falling just a year before the Battle of Clontarf, when Brian Boru met the Viking forces of Dublin and Leinster in a confrontation that would become one of the most mythologised events in the island's past. The Poddle itself was no minor watercourse in this period. It fed into the Liffey at the tidal inlet that gave Dublin, or Dubh Linn, its name, the 'black pool', and it supplied water to Dublin Castle in later centuries via a managed channel. A named crossing on this river in 1013 hints at the kind of practical, workaday geography that shaped how early medieval people actually moved through the landscape, even if the drama of the era tends to overshadow such details.

The precise location of the 'ford of the rock' is not known. Clarke's reference does not pin it to a specific street or stretch of the river, and the Poddle's course has been altered and buried over the centuries, making any physical trace extremely difficult to identify. For anyone interested in tracing the river's route, the Poddle does surface briefly in Saint Patrick's Park near the cathedral, and various local history groups have documented its hidden geography in some detail. The ford itself, though, remains one of those early medieval features that is more a name than a place, recorded once and then lost to the accumulation of the city above it.