Information about Caherduff Fort
Information from O'Donovan's Field Name Books
Irish Form of Name:
black stone fort
Other Forms of the Name with authority source (if provided) in italics:
Caherduff Fort Local
A large fort the wall of which was 10 feet broad, the foundations of it just touches Lis boundary.
Situated in the townland of Ballycolgan, a little W. of the South cluster of houses on Ballycolgan townland.
Information from the Ordnance Survey Letters:
The Ordnance Survey Letters are letters between John O'Donovan and his supervisor, Thomas Larcom, regarding the work of compiling the Field Books. These letters provide further discussion on many of the places listed in the Field Books.
References to this place can be found in the following letter.
What is a townland?:
A townland is one of the smallest land divisions in Ireland. They range in size from a few acres to thousands of acres. Many are Gaelic in origin, but some came into existence after the Norman invasion of 1169
Information From Maps
Original OS maps at the Ordnance Survey of Ireland website.
(Click on place name to view original map in new window.)
Below is a link to the Ordnance Survey of Ireland website. It displays the original OS map that was created in the 1840s.
(This information will display in a new window.)
Information from the National Monuments Service.
(This information will display in a new window.):
You can use this link to view a map of archaelogical features.
This link brings you to a website wherein you will have to search for your townland.
If you notice any inaccuracies with any of the above, please e-mail
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