[1] He belonged to the prominent Anglo-Irish Bermingham dynasty, which acquired the titles Earl of Louth and Baron Athenry.
[1] In 1248 the Crown granted to Peter Bermingham and his heirs the lands at Esker, Lucan, Dublin to hold as tenant in chief.
[3] Hart notes that such local appointments were common at the time, reflecting the disturbed state of English rule in Ireland, when no one travelled from Dublin to County Cork without an armed escort, and at a time when Carlow, the seat of the Exchequer of Ireland and the Royal Courts, had recently been burnt.
[4] In 1391 he is found pleading a case between the Crown and the Prior of the Priory of All Hallows, which was situated just outside the walls of Dublin, as to the ownership of lands at Clonturk (corresponding with present-day Drumcondra), which the Prior claimed as lands of the Priory, but which Bermingham argued had reverted to the Crown.
In 1404 he was one of four judges who tried an action for novel disseisin between Nicholas Crystor and the Stokes family concerning lands at Siddan, County Meath.