See also references for related subjects.
Dawson, Elizabeth, “Brigit and Patrick in Vita prima sanctae Brigitae: veneration and jurisdiction”, Peritia 28 (2017): 35–50.  
The early medieval cults of the saints Patrick and Brigit are most often associated with their churches at Armagh and Kildare, and the rivalry for preeminence that existed between the two federations. This paper considers the depiction of the saints in the Vita Prima Sanctae Brigitae and explores how these portrayals represent the wider cults of both.