Ok thought I would start a thread to answer that "question" about Ardgillan and some history about the place in general.
What is the Griffith Valuation?
First of all most of North Co Dublin falls under the Barony of Balrothery which is sub-divided into the Barony of West and East Balrothery. If you check the post about Baldungan castle and knight templers on the history of rush thread for further reading on the barony.
From Chapters of Ireland
Ok well parishes existed before the Reformation and after.
So if we search the Griffith Valuation for Taylor, Barony of East Balrothery and parish of Balrothery we get the below.
Family Name 1 TAYLOR
Forename 1 AND REV. E.
Family Name 2 In Fee
Barony BALROTHERY, EAST
Townland ARDGILLEN DEMESNE
Place Name ARDGILLEN DEMESNE
Place Type TOWNLAND
A map is provided on the link too.
At the end of the day Ardgillan is still in Fingal.
Ok behind the formal Victorian Walled Garden is a building buried at the edge of woods called the Ice House.
Victorian Food Storage