The Primary Valuation of Ireland, commonly known as Griffith's Valuation, was a nationwide survey of property that was undertaken between 1847 and 1864 for the purposes of assessing the rate of local property tax. The valuation recorded the occupier, the immediate lessor (landlord), and the description, size and valuation of every property on the island.
The Valuation Office Revision Books, also known as the Cancelled Books, are manuscript copies of Griffith's Valuation that were periodically updated to record any changes to the ownership, occupancy, size,
