A theachtaire tig ón Róimh is a poem "somewhat doubtfully attributed to Giolla Brighde Mac Con Midhe

Giolla Brighde Mac Con Midhe

-Background and family:Giolla Brighde Mac Con Midhe was a descendant of the Cenél nEógain; Ceart Uí Néill places the Mac Con Midhe family in the area of Ardstraw. His mother was of the Cenél Chonaill, so he addressed poems to the Ó Domhaills as well as the Ó Néills...

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The poem insists upon the need for genealogy

Genealogy

Genealogy is the study of families and the tracing of their lineages and history. Genealogists use oral traditions, historical records, genetic analysis, and other records to obtain information about a family and to demonstrate kinship and pedigrees of its members...

 to "preserve due class distinctions in Irish society, while the versifying of battle deeds guarantees immortal fame for the chieftains concerned."

Extracts

• The suppression of encounters and battles of the men of Ireland would be a faulty matter:
• there would be no interest shown in prince nor noble descendants after their death, though their courage had been good ...

• If poems did not preserve all that they had done, even though they were noble heroes,
• there would long since have been a cloak of silence upon Niall, Conn and Cormac ...

(i.e., Niall Noígíallach, Conn Cétchathach and Cormac mac Art)

• Were it not for poetry, sweet-tongued harp of psaltery would not know of a goodly hero after his death
• nor of his reputation nor his prowess.