JOHN HAMILTON (1576-1639), of Coronary, County Cavan, and Hamiltonsbawn, County Armagh, next brother of James Hamilton, created Viscount Claneboye, married, in 1617, Sarah, daughter of Anthony Brabazon, Governor of Connaught, and brother to Edward, Lord Ardee, father of William, 1st Earl of Meath, and had issue,
Hans, Rt Hon Sir, Baronet, MP;Mr Hamilton's second son,
JAMES, of whom we treat;
Francis, of Tullabrack, County Armagh;
HENRY HAMILTON, of Bailieborough, County Cavan, who wedded, before 1685, Rebecca Blackwell, and had issue,
John;Mr Hamilton was killed at Limerick in 1691, and was succeeded by his surviving son,
JAMES HAMILTON, of Bailieborough, County Cavan, born ca 1685, MP for Carlow, who married Anne Hall, and had, with other issue,
Hans;Mr Hamilton was succeeded by his surviving son,
JAMES HAMILTON (1727-1800), of Sheepshill, Abbotstown, and HolmPatrick, Deputy Protonotary of the Court of King's Bench, who married thrice.
The eldest son by his first marriage,
HANS HAMILTON MP (c1758-1822), of Sheephill and Holmpatrick, County Dublin, Captain, 5th Dragoons, High Sheriff of County Dublin, 1803, MP for County Dublin, who espoused firstly, in 1787, Sarah, daughter of Joseph Lynam, and had issue,
Sarah;He married secondly, Anne, daughter of Hugh Henry Mitchell, and had issue,
JAMES HANS, his heir;Mr Hamilton was succeeded by his only son,
Frances Caroline; Harriette Augusta.
JAMES HANS HAMILTON JP DL (1810-63), High Sheriff of County Dublin, 1832, MP for County Dublin, 1841-63, who wedded, in 1833, Caroline, daughter of John Frederick Trant, and had issue,
Hans James (1835-62);Mr Hamilton was succeeded by his surviving son,
ION TRANT, his successor.
THE RT HON ION TRANT HAMILTON JP DL (1839-98), MP for County Dublin, 1863-85, Lord-Lieutenant for County Dublin, 1892-98.
Mr Hamilton was elevated to the peerage, in 1897, by the title of BARON HOLMPATRICK, of Holmpatrick, County Dublin.
His lordship married, in 1877, Victoria Alexandrina, daughter of Major-General Lord Charles Wellesley, and granddaughter of Arthur, 1st Duke of Wellington, and had issue,
HANS WELLESLEY, his successor;
Winifred; Margaret Augusta; Georgina; Sybil Evelyn; Clare.
The heir presumptive is the present holder's brother, the Hon Ion Henry James Hamilton.
- Hans Wellesley Hamilton, 2nd Baron (1886–1942)
- James Hans Hamilton, 3rd Baron (1928–91)
- Hans James David Hamilton, 4th Baron (b 1955)
ABBOTSTOWN HOUSE, Castleknock, County Dublin, is a two-storey house, extended at various times, though mainly early to mid-19th century.
It has a five-bay entrance front, the central bay breaking forward with a triple window above a projecting, pilastered porch.
There is a similar side elevation, with a single-storey, pillared bow in lieu of a porch; elongated by a full-height curved bow.
Abbotstown House remained the seat of the HolmPatricks until 1947, when the 3rd Baron lost part of his lands under a Compulsory Purchase Order to allow for the building of a Hospital.
Later, Lord HolmPatrick sold remaining lands at Abbotstown to the Marine Institute of Ireland, which was located at Abbotstown House until 2005, when the house was acquired for Sports Campus Ireland.
In the late 1990s, half of the lands under the ownership of the local health board were sold for development in order to finance the redevelopment of the hospital buildings.