JOHN McMAHON (c1754-1817), son of John McMahon, of County Leitrim (butler to Robert, 1st Earl of Leitrim), married firstly, Elizabeth Ramsay, of Bath, Somerset; and secondly, Mary, daughter of James Stackpoole, of Cork, by whom he had two sons,
WILLIAM, his successor;
Thomas, a military officer.
WILLIAM McMAHON (1776-1837) having been bred to the bar, was appointed Master of the Rolls in Ireland, and sworn of the privy council.
Mr McMahon was created a baronet in 1815.
Sir William married firstly, in 1807, Frances, daughter of Beresford Burston, of the Irish Bar, and one of His Majesty's counsel, by whom he had issue,
BERESFORD BURSTON, his heir;He married secondly, in 1814, Charlotte, daughter of Robert Shaw, of Dublin, and sister of Sir Robert Shaw Bt, by whom he had issue,
William John, b 1811.
Charlotte; Louisa; Wilhelmina.
SIR BERESFORD BURSTON McMAHON (1808-73), 2nd Baronet, of Fortfield House, captain in the Scots Fusilier Guards, married, in 1838, Maria Catherine, daughter of Sir Robert Bateson Bt, of Belvoir Park, Belfast.
By his wife he had issue,
WILLIAM SAMUEL, his heir;
Robert Bateson, died unmarried;
Beresford Burston, died unmarried;
Gerald Charles, died unmarried;
LIONEL, 4th Baronet;
Catherine Charlotte; Frances Thomasine;
Maria Constance Georgiana; Nina Gertrude.
SIR WILLIAM SAMUEL McMAHON JP DL, (1839-1905), 3rd Baronet, captain in the 2nd Life Guards; attaché to the British Legation at Munich; DL for counties Tyrone and Clare.
Sir William died unmarried and was succeeded by his brother,
Lieutenant in the 58th Regiment; fought in the Zulu War, 1879; admitted to Inner Temple, entitled to practice as a barrister; DL of County Tyrone; High Sheriff of County Tyrone, 1914.On his death, the baronetcy became extinct.
Sir Charles McMahon (1824-91), Knight, youngest son of the 1st Baronet, was born at Omagh, County Tyrone and served with the army in Canada and India. In 1853, he went to Australia and was became Melbourne's Chief Commissioner of Police.
At one time his remarkably successful business deals were called into question, but he survived the accusations and was elected a member of the Legislative Assembly and was knighted in 1875. Sir Charles was born at Fecarry Lodge, Omagh, County Tyrone.
THE VILLAGE of Mountfield, near Omagh, was developed mainly in the 1800s by the 1st Baronet in order to rival Omagh.
The McMahons lived at Fecarry Lodge, near the village.
The area was acquired in 1846, following the sale of the Blessington estate.
The 1st Baronet initially built Fecarry Lodge; Mountfield Lodge was built later.
In 1911, the 3rd Baronet's address was listed as Mountfield Lodge; and he also had a London home at 214 Finchley Road, Hampstead.