breatnach also points out that geoffrey keating, in a list of extant manuscripts known to him, distinguishes between the saltair na rann by óengus céile dé, i.e. rawlinson b 502 (second part), and the book of glendalough. ó riain objects, however, that keating does not claim to have witnessed all these manuscripts in person and so might not have been aware that the manuscript he used, at least by the time he wrote book iii, was formerly known as the book of glendalough.