The Peerage refers to him as "4th Baron of Kerry and Lixnaw" (son of Nicholas, 2nd Baron) and mentions 2 wives: Honora O'Brien and Elinor FitzGerald.
A possible 3rd wife (m.1374) was Joan Butler, daughter of James, 2nd Earl of Ormond. According to the Ormond Deeds (Vol.2, No.189),[1] in May 1374 a marriage contract was drawn up between the Earl of Ormond (father of "Johanna") and John FitzNicholas FitzMaurice, Lord of Kerry.[2][3]
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F > FitzMaurice > John FitzMaurice