Newcastle (County Dublin barony)

Newcastle (Irish: An Caisleán Nua)[l 1] is a feudal title of nobility and one of the baronies of Ireland.

[2] It stretches from the River Liffey to the Wicklow Mountains (from north to south) and from the border with County Kildare to Clondalkin and Palmerstown (from west to east).

Through grants and intermarriage, by the time of the shiring of County Dublin, Newcastle-Lyons was raised to the status of an Irish feudal barony.

It later became a pocket borough until the Parliamentary Union of Dublin with Westminster in the United Kingdom of Great Britain and Ireland in 1801.

After the Union, and the famine, the Barony like Dublin City and County went into a long period of economic and population decline.