16 ProcecdiiKj^ of the Royal Irhh Aeddemij. 



The Magnus mac Mathgamhna, to whom the discourse in vol. ii., 

 14 h, is addressed, probably belonged to the same family as Sean 

 ua Coi^chobair: Manus and Mahon .vere both names Tery eommon 

 Long these O'Conors, as a glance at the Index to the Four Masters 



""'At"!" the Augustine mac Eaighin mentioned as a translator at 

 .01 i 32, V a, see Plummer in ZCP. v. 453. He jas a canon oi 

 Oilen na iaomh. that is, Saints' Island in Lough Ree. As Loug^ 

 Eee separates County Roscommon from County Longford this item 

 S information agrees .ith the indications of lo-h y ali.ady oh 

 tained. And perhaps this Mac Raighm, ^ho died in 140o, 

 belonged to the ;ame family as the Piaras mac Craidin -n ioned by 

 the Four Masters 1512), as Dean of the Clann Aodh ; this clan, 

 according to O'Donovan, belonged to the barony of Longford. 



These assumptions are in accordance with two dates which occur 

 in the -lis In vol. i., 29 recto, col a, the year 1435 is mentioned ; 

 and, in the first folio of vol. ii., though much defaced, the figures 



1440 are still legible. , . , t,. 



Of the subsequent history of the codex not much is known. In 

 the eighteenth century, it was in the possession of a Dr. John Fergus, 

 a collector of books and mss. (Irish Quarterly Review for 18o3 

 p. 608, note. This article is by the late Sir J. T Gilbert) This 

 Dr Fergus practised in Dublin, where he died m 1761 ; but it seems 

 likely that he came from the West. Enquiries made at the Record 

 Office show that a Hugh Fergus, of Galway, who made his will m 

 1758, was a Doctor of Medicine. William Fergus, of Tuam, who 

 made his will in 1798, was also a Doctor of Medicine. Medicine like 

 the other liberal arts, was often hereditary among the native Irish 

 families, and members of such families frequently became regular 

 practitioners. (See Joyce, Social History of Anctent IreUnd, 

 601 ) It is probable, then, that John, Hugh, and WiU.am 

 Fergus belonged to such a family, belonging to some part of 



Connaught ^ which the ms. now bears indicates that it had been an 

 heirloom of the Fergus family. I have found no internal evidence m 



parish of Tibohine, Co. Roscommon. Ciarraige Aude ^vlll, therefore, be a mis- 

 '•ritiL of Ciarraige Airtich, a district which (accordrng to O'Donovan, ZeMar 

 anting ot ° comprises the parishes of Tibohine and KUnamanagh. 



Dr.Cn. to :h;:?Urt'hese refercLes. sngge.^ that the name Lis Aedain 

 survives in Lissian, now a townland in the barony of Frenchpark. 



