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Fiant is an abbreviation of Fiant litterae patentes, which means Let letters patent be made. These were warrants to the Court of Chancery in Ireland, which was the authority for the issue of letters patents under the Great Seal. They dealt with matters ranging from appointments to high office and important government activities, to grants of pardons to the humblest of the native Irish.
The original fiants were destroyed in 1922, in a fire at the Four Courts, but the material had been calendared.