Auraicept na n-Éces

Auraicept na n-Éces (Old Irish: [ˈaurikʲept na ˈnʲeːgʲes]; "the scholars' [éices] primer [airaiccecht]"; Scottish Gaelic: Uraiceachd nan Èigeas, Irish: Uraiceacht na nÉigeas) is an Old Irish text on language and grammar. It was historically thought to be a 7th-century work of Irish grammarians, written by a scholar named Longarad. The core of the text may date to the mid-7th century, but much material was added between that date and the production of the earliest surviving copy in the 12th century. If it indeed dates to the 7th century, the text is the first instance of a defence of vernaculars, defending the spoken Irish language over Latin, predating Dante's De vulgari eloquentia by 600 years and Chernorizets Hrabar's O pismeneh by 200 years.