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In page County Kilkenny:

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The name Osraige is said to be from the Usdaie, a Celtic tribe that Ptolemy's map of Ireland places in roughly the same area that Osraige would later occupy. The territory indicated by Ptolemy probably included the major late Iron Age hill-fort at Freestone Hill which produced some Roman finds. Also the interesting burial at Stoneyford which is of typical Roman type and probably dates to the 1st century AD.[citation needed] The Osraighe themselves claimed to be descended from the Érainn people. Others propose that the Ivernic groups included the Osraige of the Kingdom of Osraige/Ossory.[4] The Brigantes were the only Celtic tribe to have a presence in both England and Ireland, in the latter of which they could be found around Kilkenny, Wexford and Waterford.[5]