quality:corruption
English and Irish languages

Dublin was traditionally a city of two languages, English and Irish, a situation found also in the area around it, the Pale. The Irish of County Dublin represented the easternmost extension of a broad central dialect area which stretched between Leinster and Connacht, but had its own local characteristics. It may also have been influenced by the east Ulster dialect of County Meath and County Louth to the north.

In the words of a 16th-century English administrator, William Gerard (1518–1581): "All Englishe, and the most part with delight, even in Dublin, speak Irishe". The Old English historian Richard Stanihurst (1547–1618) wrote as follows: "When their posteritie became not altogither so warie in keeping, as their ancestors were valiant in conquering, the Irish language was free dennized in the English Pale: this canker tooke such deep root, as the bodie that before was whole and sound, was by little and little festered, and in manner wholly putrified".

English authorities of the Cromwellian period accepted the fact that Irish was widely spoken in the city and its surrounds. In 1655 several local dignitaries were ordered to oversee a lecture in Irish to be given in Dublin. In March 1656 a converted Catholic priest, Séamas Corcy, was appointed to preach in Irish at Bride's parish every Sunday, and was also ordered to preach at Drogheda and Athy. In 1657 the English colonists in Dublin presented a petition to the Municipal Council complaining that in Dublin itself "there is Irish commonly and usually spoken".

In early 18th century Dublin, Irish was the language of a group of poets and scribes led by Seán and Tadhg Ó Neachtain. Scribal activity in Irish persisted in Dublin right through the 18th century. There were still native Irish speakers in County Dublin at the time of the 1851 census.

Though the number of Irish speakers declined throughout Ireland in the 19th century, the end of the century saw a Gaelic revival, centred in Dublin and accompanied by renewed literary activity. This was the harbinger of a steady renewal of urban Irish, though with new characteristics of its own.