This branch of the noble house of STEWART claims a common ancestor with the Earls of Galloway; namely, Sir William Stewart, of Garlies, from whose second son, Sir Thomas Stewart, of Minto.
WILLIAM STEWART, of Ballylawn Castle, County Donegal (great-grandson of John Stewart, who had a grant from CHARLES I of Stewart's Court Manor, where he erected Ballylawn Castle), took an active part in Ulster affairs in order to prevent the subversion of the constitution, which King JAMES II and his chief governor, the Earl of Tyrconnell, were attempting to effect.
He raised a troop of horse at his own expense when the city of Londonderry was occupied, and actively promoted the Protestant interest there by protecting those who were favourably disposed to WILLIAM III.
Mr Stewart was appointed lieutenant-colonel in the regiment commanded by Sir William Stewart, Viscount Mountjoy.
He married the daughter of William Stewart, of Fort Stewart, County Donegal (grandson of the Rt Hon Sir William Stewart Bt, whose descendant was created Baron Stewart of Ramelton and Viscount Mountjoy), and died leaving issue, a daughter,
MARTHA, who wedded John Kennedy, of Cultra, County Down; and two sons, of whom
THOMAS KENNEDY, the eldest, succeeded at Ballylawn Castle, and served as a captain in Lord Mountjoy's regiment.
He espoused Mary, second daughter of Bernard Ward (ancestor of the Viscounts Bangor), by Mary, sister of the Rt Rev Michael Ward, Lord Bishop of Derry; and dying without issue, 1740, was succeeded by his only brother,
ALEXANDER STEWART (1699-1781), who represented the city of Londonderry in parliament, and purchased the estate of MOUNT STEWART, County Down, from the Colville family.
He married, in 1737, his cousin Mary, only daughter of Alderman John Cowan, of Londonderry (by Anne Stewart, second daughter of Alexander Stewart, of Ballylawn Castle, and sister and sole heir of Sir Robert Cowan, Governor of Bombay, and had issue,
ROBERT, his heir;The eldest son,
William, died in infancy;
Anne; Frances; Mary.
ROBERT STEWART (1739-1821), of Ballylawn Castle, County Donegal, and of Mount Stewart, County Down, who, having represented the latter county in parliament, and having been sworn a member of the Privy Council, was elected to the Irish peerage, in 1789, as Baron Stewart.
His lordship was advanced to the dignity of Viscount Castlereagh in 1795, and Earl of Londonderry in 1796.
This nobleman was further advanced to the dignity of a marquessate, as MARQUESS OF LONDONDERRY, in 1816.
His lordship wedded firstly, in 1766, the Lady Sarah Frances Seymour-Conway, second daughter of Francis, 1st Marquess of Hertford, and had issue,
Alexander Francis, 1767-9;He wedded secondly, in 1775, the Lady Frances Pratt, eldest daughter of Charles, 1st Earl Camden, and had issue,
ROBERT, his successor.
CHARLES WILLIAM, 3rd Marquess;His lordship was succeeded by his eldest son,
Alexander John, 1783-1800;
Thomas Henry, 1790-1810;
Frances Anne; Elizabeth Mary; Caroline; Georgiana;
Selina Sarah Juliana; Matilda Charlotte; Emily Jane; Catharine Octavia.
ROBERT, 2nd Marquess (1769-1822), KG, GCH, PC.
Former seats ~ Mount Stewart, County Down; Wynyard Park, County Durham; Seaham Hall, near Stockton-on-Tees.
The heir presumptive is his brother Lord Reginald Alexander Vane-Tempest-Stewart (b. 1977).
- Robert Stewart, 1st Marquess (1739–1821);
- Robert Stewart, 2nd Marquess (1769–1822);
- Charles William Stewart, 3rd Marquess (1778–1854);
- Frederick William Robert Stewart, 4th Marquess (1805-72);
- George Henry Robert Charles William Vane-Tempest, 5th Marquess (1821-84);
- Charles Stewart Vane-Tempest-Stewart, 6th Marquess (1852–1915);
- Charles Stewart Henry Vane-Tempest-Stewart, 7th Marquess (1878–1949);
- Edward Charles Stewart Robin Vane-Tempest-Stewart, 8th Marquess (1902-55);
- Alexander Charles Robert "Alistair" Vane-Tempest-Stewart, 9th Marquess (1937–2012);
- Frederick Aubrey Vane-Tempest-Stewart, 10th Marquess (b 1972).
The heir presumptive's heir is his son Robin Gabriel Vane-Tempest-Stewart (b 2004).
Former town residence ~ Londonderry House, Park Lane, London.
First published in March, 2012.