Pre-Viking Dublin
Although the site of the modern city of Dublin has been occupied intermittently since the Mesolithic era, it is not known when the first permanent settlement was established. Ptolemy's description of Ireland, which was compiled around 140 AD but which may draw on much earlier accounts, was once thought to contain a reference to Dublin in Eblana, the name of a settlement on the east coast; this, however, is no longer thought likely and the similarity of the two names is probably coincidental.
Early Dublin is also referred to in a number of native sources. The Book of Invasions, a largely fabulous compilation of myths and legends, mentions Dublin when describing how two legendary kings of Ireland, Conn of the Hundred Battles and Mug Nuadat, divided the country between them. The line of demarcation, which cut the island into two symbolic halves (known as Leth Cuinn, or "Conn's Half", and Leth Moga, or "Mug's Half") ran along the Esker Riada from High Street in Dublin to Galway on the west coast. According to another work which draws on early sources, the Annals of the Four Masters, Fiachu Sraibtine, the king of Tara, quelled the rebellious inhabitants of Leinster in a battle fought at Dublin in 291 AD; the Annals of Dublin also record that Alphin mac Eochaid, King of Dublin, was converted to Christianity by Saint Patrick in 448 AD. But these entries were only added to the Annals', or the sources from which they were compiled, many centuries after the events they purport to record, and no reliance can be placed on them. The simple fact is that we do not know for certain when the city of Dublin was founded.
When contemporary records begin in the 5th century, there is a thriving community of farmers and fishermen in existence in the vicinity of Cornmarket and High Street. A ringed pattern of streets and laneways which can still be discerned in this part of the modern city may be a relic of the original boundary of an early settlement. Located on a prominent ridge overlooking the River Liffey (previously known as the Ruirthech, "running swiftly"), this settlement was easily defended and ideally situated to take advantage of the ford, which lay just 100 metres away.
The name ford of hurdles – Áth Cliath in Irish – suggests that, to facilitate travellers who wished to cross the river dry-shod during low tide, the inhabitants of this settlement constructed a lattice-work of interlaced osiers – hurdles – and secured it to the muddy bed of the river, perhaps making use of the fortuitously placed Usher's Island in the middle of the stream. It is also possible that a series of hurdles used as fish-traps were placed along the banks of the river. The hurdles were probably located about 100 metres west of the point where Father Mathew Bridge now crosses the Liffey, but in the absence of archaeological evidence both its nature and precise location must remain matters of speculation.
In ancient times the lower course of the Liffey is believed to have formed part of the boundary between the provinces, or overkingdoms, of Leinster and Mide (though there is some conflicting evidence which suggests that the boundary was actually marked by another river, the Tolka, which now discharges into Dublin Bay about a kilometre north of the Liffey). Áth Cliath, which belonged to Leinster, must have been an important trading place thanks to its strategic location on this political boundary.
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