Claffey, J.A. Richard de Burgh, Earl of Ulster c1260-1326. unpublished Ph.D thes...

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Claffey, J.A. Richard de Burgh, Earl of Ulster c1260-1326. unpublished Ph.D thesis, University College of Galway (1970), pp. 148, 171, cited in Penman, Michael. Robert the Bruce. New Haven and London:Yale University Press (2014), papbk. 2018, p. 66

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