657.
Ó Concheanainn (Tomás): Gilla Ísa Mac Fir Bhisigh and a scribe of his school.
In Ériu 25 (1974), pp. 157–171.
Identifies the anonymous scribe of parts of YBL as Tomás Cam Mac Fir Bhisigh (son of Gilla Ísa) and identifies him with hand in the following MSS: RIA 23 P 2 (Book of Lecan), RIA D i 1, NLS 72.1.8, NLI G 4, TCD H 2.15a. Includes 9 plates.

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