It is now thought that the Viking settlement was preceded by a Christian ecclesiastical settlement known as Duibhlinn, from which Dyflin took its name.
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The Dubhlinn was a small lake used to moor ships; the Poddle connected the lake with the Liffey.
This lake was covered during the early 18th century as the city grew.
The original pronunciation is preserved in the names for the city in other languages such as Old English Difelin, Old Norse Dyflin, modern Icelandic Dyflinn and modern Manx Divlyn as well as Welsh Dulyn.
Other localities in Ireland also bear the name Duibhlinn, variously anglicized as Devlin, Historically, scribes using the Gaelic script wrote bh with a dot over the b, rendering Duḃlinn or Duiḃlinn.
The Dubhlinn lay where the Castle Garden is now located, opposite the Chester Beatty Library in Dublin Castle.
Táin Bó Cuailgne ("The Cattle Raid of Cooley") refers to Dublind rissa ratter Áth Cliath, meaning "Dublin, which is called Ath Cliath".
Following Mac Murrough's death, Strongbow declared himself King of Leinster after gaining control of the city.
In response to Strongbow's successful invasion, King Henry II of England reaffirmed his sovereignty by mounting a larger invasion in 1171 and pronounced himself Lord of Ireland.
Dublin prospered as a trade centre, despite an attempt by King Robert I of Scotland to capture the city in 1317.
It remained a relatively small walled medieval town during the 14th century and was under constant threat from the surrounding native clans.
Those without knowledge of Irish omitted the dot, spelling the name as Dublin.