Events from the year 1738 in Ireland.
- Roxborough Castle in Moy, County Tyrone, built by James Caulfeild, 4th Viscount Charlemont.
- Rev. Samuel Madden publishes Reflections and Resolutions Proper for the Gentlemen of Ireland, as to their Conduct for the Service of their Country, as Landlords, as Masters of Families, as Protestants, as Descended from British Ancestors, as Country Gentlemen and Farmers, as Justices of the Peace, as Merchants, as Members of Parliament.
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