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From CODECS: Online Database and e-Resources for Celtic Studies
Thornton, David E., “Cadell Ddyrnllug (fl. 5th cent.)”, Oxford dictionary of national biography, Online: Oxford University Press, 2004–.
Thornton, David E., “Illtud (fl. 5th–6th cent.)”, Oxford dictionary of national biography, Online: Oxford University Press, 2004–.