evidence: History of the Irish language The history of the Irish language begins with the period from the arrival of speakers of Celtic languages in Ireland to Ireland's earliest known form of Irish, Primitive Irish, which is found in Ogham inscriptions dating from the 3rd or 4th century AD.[1] After the conversion to Christianity in the 5th century, Old Irish begins to appear as glosses and other marginalia in manuscripts written in Latin, beginning in the 6th century. It evolved in the 10th century to Middle Irish. Early Modern Irish represented a transition between Middle and Modern Irish. Its literary form, Classical Gaelic, was used by writers in both Ireland and Scotland until the 18th century, in the course of which slowly but surely writers began writing in the vernacular dialects, Ulster Irish, Connacht Irish, Munster Irish and Scottish Gaelic. As the number of hereditary poets and scribes dwindled under British rule in the early 19th century, Irish became a mostly spoken tongue with little written literature appearing in the language until the Gaelic Revival of the late 19th century. [...] - ^ a b Pritchard, R.M.O (2004). "Protestants and the Irish Language: Historical Heritage and Current Attitudes in Northern Ireland". Journal of Multilingual and Multicultural Development. 25 (4): 62–82. doi:10.1080/01434630408666520. S2CID 3062671. Retrieved 23 May 2023.