The scribe of the manuscript is Sémus Ó Gribín, who also wrote Royal Irish Academy 24 L 17, Geoffrey Keating’s ‘Eochair-Sgiath an Aifrinn’. He completed the manuscript in March 1696 for Patrick Logan, schoolmaster at Lurgan. Bound in (folios vi-vii) is a letter dated Lurgan, 17th August 1696, from Logan to an unnamed friend, consigning the manuscript to him for scholarly perusal and ultimate delivery to the Advocates Library. It thus became the first of the Advocates’ Gaelic manuscripts. Marginal notes in English (late 17th-century hand) occur at folio 156 verso.

The contents are as follows.

(i) “Díonbhrollach” (folio 1);

(ii) Book 1. (folio 109 verso, colophon, 21 January 1696);

(iii) Book 2 (folio 110 recto);

(iv) Genealogies (folio 183 recto (bottom of page) colophon, 14 March 1696).