Cuireann fianaise ón mBreatnais in úil go raibh an-tionchar ag an Laidin ar an mBriotainis le linn na ré Rómhánaí, go háirithe téarmaí gaolmhar leis an eaglais agus le Críostaíocht an Iarthair.[11] Faoin séú haois AD, bhí teanga na mBriotanach Ceilteach ag scaradh ina Nua-Bhriotainic: Breatnais, Coimbris, Coirnis, Briotáinis agus b'fhéidir Cruithnis.
Tháinig teangacha eile chun cinn in ionad Briotainic in Albain (Gaeilge na hAlban) agus i Sasana agus chomh maith le hAlbain taobh ó dheas de Linne Foirthe (Sean-Bhéarla, as a thagann Béarla agus Albainis).[12] Fuair Coimbric bás sa 12ú haois[12] agus d'éag Coirnis san iardheisceart san ochtú haois déag, cé go bhfuil athbheochan ar siúl ann.[13][14] Is iad Breatnais agus Briotáinis amháin atá tagtha slán go dtí an lae inniu.
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↑Ferdinand, Siarl (2018). "The Promotion of Cornish in Cornwall and the Isles of Scilly: Attitudes towards the Language and Recommendations for Policy". Studia Celtica Fennica19: 107–130. doi:10.33353/scf.79496.
Is síol faoi theangacha é an t-alt seo. Cuir leis, chun cuidiú leis an Vicipéid. Má tá alt níos forbartha le fáil i dteanga eile, is féidir leat aistriúchán Gaeilge a dhéanamh.