An Leabhar Breac
An Leabhar Breac ('The Speckled Book'; Middle Irish: An Lebar Brec), now less commonly Leabhar Mór Dúna Doighre ('Great Book of Dun Doighre') or possibly erroneously, Leabhar Breac Mic Aodhagáin ('The Speckled Book of the MacEgans'), is a medieval Irish vellum manuscript containing Middle Irish and Hiberno-Latin writings. The manuscript is held in the library of the Royal Irish Academy in Dublin, where it is catalogued as RIA MS 23 P 16 or 1230.