From A Topographical Dictionary of Ireland, 1837
KINSEALY, a parish, in the barony of COOLOCK, county of DUBLIN, and province of LEINSTER, 1 ½ mile (S.) from Malahide; containing 650 inhabitants. It comprises 2105 statute acres, and is well cultivated. Feltrim Hill, on which are the remains of an encampment, commands magnificent sea and mountain views. Under this hill is a limestone quarry, in which fossils are frequently found, and near it is a holy well. Abbeville, a spacious mansion, was erected by the late Rt. Hon. J. C. Beresford, and is now occupied by H. and J. Batchelor, Esqrs.; in the gardens is a greenhouse more than 400 feet long. The other seats are Greenwood, the residence of W. Shaw, Esq.; Feltrim, of C. Farran, Esq., M.D.; Auburne, of J. Crawford, Esq.; Clairville, of Major St. Clair; and Kinsealy House, of J. Gorman, Esq. It is a vicarage, in the diocese of Dublin, forming part of the union of Swords; the rectory is appropriate to the economy estate of St. Patrick's cathedral, Dublin.
The tithes amount to £224. 16. 1 ½., of which one-third is payable to the lessee of the economy estate, and two-thirds to the vicar.
In the R. C. divisions it forms part of the union or district of Baldoyle and Howth; a small neat chapel with a spire was erected here by subscription in 1834. There is a public school, in which about 70 children are educated. The church, which was dedicated to St. Nicholas, is a picturesque ruin covered with ivy.