A further Irish patron of Barret was the Thomas Conolly of Castletown House of Celbridge to the west of Dublin. He inherited Castletown House in 1758 and his wife Lady Louisa Conolly (who was the daughter of Charles Lennox, 2nd Duke of Richmond), set about redecoration and refurbishment of this Palladian mansion. Barret supplied a painting of the house in the distance with wooded parkland and a river. The trees are depicted in outline and not in Barret's later spindly way. John Harris remarks that it is "softly and atmospherically painted, and of course, is free from the influence of Wilson and other London based painters".