AD 902 — 1013

Norse Cities & the Rise of Brian

Expelled from Dublin in 902, the Norse come back in force. Waterford is founded in 914 and Limerick soon after. The raiders are changing. They are becoming traders, town-builders and Christians. And in Munster an obscure dynasty called the Dál gCais smashes Norse Limerick, takes Cashel, and produces Brian Boru, who claims the high kingship of all Ireland by 1002.

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📜 The chronicle — events of this age
AD 902
Vikings expelled from Dublin
Irish kings storm the town; the Norse decamp — for a generation.
AD 914
Waterford founded
A new Norse fleet establishes Veðrafjǫrðr — Ireland's oldest continuous city.
AD 919
Battle of Islandbridge
The returned Dublin Norse kill High King Niall Glúndub and five other kings.
AD 922
Norse Limerick founded
A Viking fleet plants itself on the Shannon at Inis Sibhtonn.
AD 967
Dál gCais sack Limerick
Mathgamain and his brother Brian break Norse Limerick at Sulcoit.
AD 976
Brian Boru king of Munster
Brian succeeds his murdered brother and takes Cashel.
AD 980
Battle of Tara
Máel Sechnaill defeats Dublin; the Norse towns become tributary prizes.
AD 999
Battle of Glen Máma
Brian crushes Leinster and Dublin, then famously winters in the captured town.
1002
Brian Boru High King
Máel Sechnaill yields; a Munster king holds Tara's title for the first time.
1005
'Emperor of the Irish'
At Armagh, Brian's secretary writes him into the Book of Armagh as Imperator Scotorum.
Quick answers
When was Norse Cities & the Rise of Brian in Ireland?

Norse Cities & the Rise of Brian spans AD 902 to 1013 in this atlas. Expelled from Dublin in 902, the Norse come back in force.

Who ruled Ireland during Norse Cities & the Rise of Brian?

Power was divided: The Connachta (6 counties); Laigin (Leinster) (5 counties); Airgíalla (Oriel) (4 counties); Mide (Kingdom of Meath) (4 counties); Mumu (Munster) (4 counties), among others. County boundaries are modern approximations.

What is a lesser-known fact about Norse Cities & the Rise of Brian?

The Norse never conquered Ireland the way they conquered half of England — but they gave Ireland almost all of its oldest cities, and words like 'margadh' (market) and half the coastal place-names from Strangford to Smerwick.

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