Plummer provides thirteen of the most ancient Irish litanies extant, in the original Irish with a clear, accurate English translation. An introduction gives information about the manuscripts, dating from the 12th(?) to 15th centuries, in which the litanies are found. Endnotes provide some clarification of obscure passages.
The litanies themselves:
Of Confession
Of the Saviour
Of the Virgin and all Saints
Of Jesus (2)
Of the Virgin Mary
Of the Irish Saints (2)
Of the Trinity
Of St. Michael
Of the Virgin Saints
Of the Virgin Mary
Of Creation.
With a good translation and good notes, this book is valuable for the scholar and the pray-er.

This Latin and Old Irish codex contains the only complete Irish liturgy to survive the supression of the Irish churches by the Roman Catholic English Normans.
It provides a valuable means of understanding the Christianity of the pre-Schism Irish churches and what was lost in their submission to Roman practices.