Comh-Bhriotainis
Teanga Cheilteach labhartha sa Bhreatain agus sa Bhriotáin ba ea  Comh-Bhriotainis (dí-mholta  Briotainis Choiteann) (; ; ).

Is teanga de chuid Ceiltis na nOileán í, fréamhaithe ó .  Tá gaol ann le Cruithnis.

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.  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).  Fuair Coimbric bás sa 12ú haois agus d'éag Coirnis san iardheisceart san ochtú haois déag, cé go bhfuil athbheochan ar siúl ann.  Is iad Breatnais agus Briotáinis amháin atá tagtha slán go dtí an lae inniu.

Mhol Tomás Ó Rathaile go raibh teanga Bhriotainice i nÉirinn roimh theacht na dTeangacha Gaelacha, ach ní aontaítear go forleathan leis an tuairim seo.

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