Happy new year!
New freespace page Historical maps and gazetteers of Ireland describes the main historical maps of Ireland from Ptolemy onwards, with a particular focus on Tudor and Stuart plantation maps, the Down Survey and the Ordnance Survey. It also lists and links to more specialist maps like those for Giffith's valuation, the grand juries, early maps of the Irish road network, the bog survey and many atlases. There is a section on local historical Irish maps. All the main repositories of Irish maps online are listed.
A section on gazetteers points, for example, to the description of Ireland produced by Giraldus Cambrensis, not long after the Norman 'Strongbow' invasion, and the incredibly detailed Parliamentary Gazetteer drawing on the 1831 and 1841 censuses. Finally, there is a list of and links to some sources on Irish townlands and their names.
Please leave a reply or contact me if you have any suggestions for improving it.