While on military service in Ireland, in 1612 Edward Trevor married Rose, a daughter of Henry Ussher, Archbishop of Armagh, and acquired an estate in County Down which was renamed Rostrevor, incorporating his own name.
Trevor was the son of Sir Edward Trevor of Rostrevor, County Down, and of Brynkinalt Hall, near Chirk in Denbighshire, by his marriage to Rose Ussher, a daughter of Henry Ussher (ca. 1550–1613), Archbishop of Armagh.
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Fitton was the eldest son of William Fitton of Awrice, County Limerick and his wife Eva Trevor, daughter of Sir Edward Trevor of Denbighshire.