Liber Flavus Fergusiorum
| Liber Flavus Fergusiorum | |
|---|---|
| Royal Irish Academy | |
| Date | 1437–40 |
| Place of origin | Ireland |
| Language(s) | Middle Irish |
| Scribe(s) | Aedh, Seaán Ó Conchubair, Uidhisdín Mag Raighin |
| Author(s) | Ó Fearghuis |
| Material | Vellum |
The Liber Flavus Fergusiorum ("Yellow Book of the Ó Fearghuis"; RIA MS 23 O 48 a-b) is a medieval Irish text (dated to c. 1437-40) authored by the Ó Fearghuis, an Irish medical family of Connacht who were hereditary physicians to the Irish nobility.