Castleknock (barony)

[3] It stretches from Cabra to Blanchardstown (from east to west) and from Finglas to Chapelizod (from north to south).

Baronies were created after the Norman invasion of Ireland as subdivisions of counties and were used for administration.

While baronies continue to be officially defined units, they are no longer used for many administrative purposes.

In many cases, a barony corresponds to an earlier Gaelic túath which had submitted to the Crown.

Copies of the grant were discovered in the London Public Records Office in 1933 by Eric St. John Brooks.

[4] In English, the grant reads:Henry, by the grace of God, King of England, Lord of Ireland, Duke of Aquitaine and Normandy and Count of Anjou to the Archbishops, Bishops, Ministers and all Earls, Barons, Justices, Sheriffs, Ministers and all his faithful French, English and Irish, greeting.

[5]Brooks deduces that "Thwo" is an Anglicisation of the Gaelic word túath and that "throm" is an Anglicisation of the word droma which means ridge or hill - a possible reference to the hill of Castleknock where Tyrrell was to build his castle.

Mulhuddart has 22 townlands, including:[l 6] The bulk of Saint James' parish[l 7] lies south of the River Liffey.

A single townland, situated north of the river in the Phoenix Park, is part of the barony of Castleknock.