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.
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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.