R.F. Foster "The Oxford History of Ireland", paperback edition, 1992, p 38 and G...

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R.F. Foster "The Oxford History of Ireland", paperback edition, 1992, p 38 and Gwyn Jones "A History of the Vikings", 1968, p 397, cited by Darrell Wolcott, Ancient Wales Studies. Cynfyn ap Gwerystan,The Interim King Accessed August 29, 2018. jhd

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