[1] A charter of 1439, a few years before his father's death, refers to the younger Sir Christopher as lord of the manor of Dunsany (Dns.
He is referred to by William Camden, in the following century, as being the first Baron of Dunsany, that is to say, a hereditary member of the Irish House of Lords.
The Complete Peerage also notes, however, that the order of precedence was likely to reflect the relative importance of the lords, rather than the age of their titles.
Plunkett married firstly Anne FitzGerald, daughter and heiress of Richard FitzGerald of Ballysonan, County Kildare and his wife Julia de Castlemartin, daughter of Nicholas de Castlemartin and widow of Richard Wellesley.
He left many specific bequests, his lands as per an entail, and in his title, he was succeeded by his eldest son Richard Plunkett, 2nd Baron of Dunsany, one of five named in the will.