Airbertach mac Cosse, died 1016, was an

Irish Irish may refer to: Common meanings * Someone or something of, from, or related to: ** Ireland, an island situated off the north-western coast of continental Europe ***Éire, Irish language name for the isle ** Northern Ireland, a constituent unit ...

poet A poet is a person who studies and creates poetry. Poets may describe themselves as such or be described as such by others. A poet may simply be the creator ( thinker, songwriter, writer, or author) who creates (composes) poems ( oral or wr ...

lector Lector is Latin for one who reads, whether aloud or not. In modern languages it takes various forms, as either a development or a loan, such as french: lecteur, en, lector, pl, lektor and russian: лектор. It has various specialized uses. ...

and later superior of the monastery of Ros Ailithir (now

Rosscarbery Rosscarbery () is a village and census town in County Cork, Ireland. The village is on a shallow estuary, which opens onto Rosscarbery Bay. Rosscarbery is in the Cork South-West (Dáil Éireann) constituency, which has three seats. History The ...

), on the coast of south-west

County Cork County Cork ( ga, Contae Chorcaí) is the largest and the southernmost county of Ireland, named after the city of Cork, the state's second-largest city. It is in the province of Munster and the Southern Region. Its largest market towns ar ...

. ''Rofessa i curp Domuin Dúir'', a poem on the geography of the world, is ascribed to him in both the

Rawlinson B 502 Oxford, Bodleian Library, Rawlinson B 502 is a medieval Irish manuscript which presently resides in the Bodleian Library, Oxford. It ranks as one of the three major surviving Irish manuscripts to have been produced in pre-Norman Ireland, the tw ...

and the

Book of Leinster The Book of Leinster ( mga, Lebor Laignech , LL) is a medieval Irish manuscript compiled c. 1160 and now kept in Trinity College, Dublin, under the shelfmark MS H 2.18 (cat. 1339). It was formerly known as the ''Lebor na Nuachongbála'' "Book ...

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