What is "fingallian"

Fingallian or the Fingal dialect is an extinct variety of English formerly spoken in Fingal, Ireland. It is thought to have been an offshoot of Middle English, which was brought to Ireland during the Norman invasion, and was extinct by the mid-19th century. Although little is known of Fingallian, it is thought to have been similar to the Forth and Bargy dialect of County Wexford.

The surviving literature of Fingallian consists of two satirical or humorous poems, the short "Fingallian Dance" and the much longer Purgatorium Hibernicum. Both poems are anonymous and are thought to be humorous parodies of Fingallian by non-native speakers, so their value from a linguistic point of view may be limited.