sourced story
841 CEReputable source · 2 sourcesWell documented

Vikings build a longphort at Dublin

A winter naval camp on the River Liffey becomes a permanent Norse base in Ireland

On the timeline · around 841 CE · The First RaidsThe First RaidsConquest and SettlementVikings build a longphort at Dublin820 CE825 CE830 CE835 CE840 CE845 CE850 CE855 CE860 CE865 CE

Quick facts

Location
Dublin, Ireland
Date
841 CE
Structure
Longphort (naval encampment)
Later leaders
Amlaib (Olaf) and Imar (Ivar), from c. 853

What happened

Irish annals for 841 record a naval camp, or longphort, established at Dublin, one of several such fortified ship enclosures Vikings built along the Irish coast that year. A longphort let a raiding fleet stay through the winter instead of sailing home, repairing ships and holding captives while raiding further inland. The Dublin longphort sat on high ground above a dark tidal pool where the River Poddle met the Liffey, a pool the Irish called dubh linn, giving the settlement its name. By 842 the annals note the Vikings were still there, and around 853 the leaders Amlaib (Olaf) and Imar (Ivar) took it over and turned it into a hub of Norse activity across the Irish Sea.

Why it matters

The winter camp is what turned Viking activity in Ireland from seasonal raiding into permanent settlement. Dublin grew from this fortified camp into a trading town and later a kingdom that lasted for centuries, and the same longphort strategy was used at other Irish river mouths in 841.

How we know

The Annals of Ulster, an Irish monastic chronicle kept contemporaneously, record the 841 camp and the following winters directly.

Sources

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