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Earl of Orrery is a title in the Peerage of Ireland that has been united with the earldom of Cork since 1753. It was created in 1660 for the soldier, statesman and dramatist Roger Boyle, 1st Baron Boyle, third but eldest surviving son of Richard Boyle, 1st Earl of Cork. He had already been created Lord Boyle, Baron of Broghill, in the Peerage of Ireland in 1628 (at the age of only six). He was succeeded by his son, the second Earl. He represented County Cork in the Irish House of Commons and served as Vice-President of Munster. On his death, the titles passed to his eldest son, the third Earl. He represented East Grinstead in the English House of Commons. He was succeeded by his younger brother, the fourth Earl. He was a Lieutenant-General in the Army and a prominent diplomat. In 1711 he was created Baron Boyle of Marston, in the County of Somerset, in the Peerage of Great Britain. His son, the fifth Earl, succeeded his third cousin as fifth Earl of Cork in 1753. See the latter title for further history of the peerages.

Henry Boyle, son and namesake of the Hon. Henry Boyle, the younger son of the first Earl of Orrery, was created Earl of Shannon in 1756.

The Irish placename Orrery (c 1300) came from Gaelic Orbhraighe, which was at first the name of a tribe (Orbh-raighe = "Orb's people"), and then of a territory and a barony in County Cork^[1]

Earls of Orrery (1660)

Roger Boyle, 1st Earl of Orrery (1621–1679)
Roger Boyle, 2nd Earl of Orrery (1646–1682)
Lionel Boyle, 3rd Earl of Orrery (1671–1703)
Charles Boyle, 4th Earl of Orrery (1674–1731)
John Boyle, 5th Earl of Cork and Orrery (1707–1762)
Hamilton Boyle, 6th Earl of Cork and 6th Earl of Orrey (1729–1764)
Edmund Boyle, 7th Earl of Cork and 7th Earl of Orrey (1742–1798)
Edmund Boyle, 8th Earl of Cork and 8th Earl of Orrery (1767–1856)
Richard Edmund St Lawrence Boyle, 9th Earl of Cork and 9th Earl of Orrery (1829–1904)
Charles Spencer Canning Boyle, 10th Earl of Cork and 10th Earl of Orrery (1861–1925)
Robert John Lascelles Boyle, 11th Earl of Cork and 11th Earl of Orrery (1864–1934)
William Henry Dudley Boyle, 12th Earl of Cork and 12th Earl of Orrery (1873–1967)
Patrick Reginald Boyle, 13th Earl of Cork and 13th Earl of Orrery (1910–1995)
John William Boyle, 14th Earl of Cork and 14th Earl of Orrery (1916–2003)
John Richard Boyle, 15th Earl of Cork and 15th Earl of Orrery (born 1945)

The heir apparent is the present holder's only son Rory Jonathan Courtenay Boyle, Viscount Dungarvan (born 1978)

Family tree

Dukes of Devonshire, Marquesses of Hartington, Earls of Burlington, Earls of Cork, Earls of Devonshire, and Earls of Orrery

William Cavendish
(c. 1505–1557)

Bess of Hardwick
(c. 1527–1608)

Baron Boyle of Youghal, 1616
Earl of Cork and Viscount Dungarvan, 1620

Earl of Devonshire (1st creation), 1603

Baron Cavendish, of Hardwicke in the County of Derby, 1605
Earl of Devonshire (2nd creation), 1618

Richard Boyle
(1566–1643)
1st Earl of Cork Viscount Dungarvan, Baron Boyle

Charles Blount
(1563–1606)
Earl of Devonshire, 8th Baron Mountjoy

William Cavendish
(1552–1626)
1st Earl of Devonshire, 1st Baron Cavendish of Hardwick

Charles Cavendish
(1553–1617)

Earldom of Devonshire (1st creation) extinct, 1606

William Cavendish
(1591–1628)
2nd Earl of Devonshire and Baron Cavendish of Hardwick

Dukes of Newcastle (1st creation)

Baron Clifford of Londesborough, 1644
Earl of Burlington (1st creation), 1664

Earl of Orrery, 1660

Richard Boyle
(1612–1698)
2nd Earl of Cork and Viscount Dungarvan, 1st Earl of Burlington and Baron Clifford

Elizabeth Clifford
2nd Baroness Clifford suo jure

Roger Boyle
(1621–1679)
1st Earl of Orrery

William Cavendish
(1617–1684)
3rd Earl of Devonshire, 3rd Baron Cavendish of Hardwick

Duke of Devonshire and Marquess of Hartington, 1694

Charles Boyle
(1639–1694)
styled Viscount Dungarvan, 3rd Baron Clifford

Roger Boyle
(1646–1682)
2nd Earl of Orrery

William Cavendish
(1640–1707)
1st Duke of Devonshire and Marquess of Hartington, 4th Earl of Devonshire and Baron Cavendish of Hardwick

Charles Boyle
(d. 1704)
3rd Earl of Cork and Viscount Dungarvan, 2nd Earl of Burlington, 4th Baron Clifford

Lionel Boyle
(1671–1703)
3rd Earl of Orrery

Charles Boyle
(1674–1731)
4th Earl of Orrery

William Cavendish
(1672–1729)
2nd Duke of Devonshire and Marquess of Hartington, 5th Earl of Devonshire

John Boyle
(1707–1762)
5th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Richard Boyle
(1694–1753)
4th Earl of Cork, 3rd Earl of Burlington, 5th Baron Clifford

William Cavendish
(1698–1755)
3rd Duke of Devonshire and Marquess of Hartington, 6th Earl of Devonshire

Earldom of Burlington (1st creation) extinct, 1753

Hamilton Boyle
(1729–1764)
6th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Edmund Boyle
(1707–1762)
7th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Charlotte Elizabeth Boyle
(1731–1754)
6th Baroness Clifford

William Cavendish
(1720–1764)
4th Duke of Devonshire and Marquess of Hartington, 7th Earl of Devonshire

Earl of Burlington (2nd creation) and Baron Cavendish of Keighley, in the county of York, 1831

Edmund Boyle
(1767–1856)
8th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

William Cavendish
(1748–1811)
5th Duke of Devonshire and Marquess of Hartington, 8th Earl of Devonshire, 7th Baron Clifford

George Augustus Henry Cavendish
(1754–1834)
1st Earl of Burlington and Baron Cavendish of Keighley

Charles Boyle
(1800–1834)
styled Viscount Dungarvan

John Boyle (1803–1874)

Georgiana Dorothy Cavendish
(1783–1858)

William George Spencer Cavendish 🍌
(1790–1858)
6th Duke of Devonshire and Marquess of Hartington, 9th Earl of Devonshire, 8th Baron Clifford

William Cavendish
(1783–1812)

Barony Clifford abeyant, 1812

Blanche Howard
(1812–1840)

William Cavendish
(1808–1891)
7th Duke of Devonshire and Marquess of Hartington, 10th Earl of Devonshire, 2nd Earl of Burlington and Baron Cavendish of Keighley

Richard Edmund St Lawrence Boyle
(1829–1904)
9th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Gerald Edmund Boyle

Spencer Compton Cavendish
(1833–1908)
8th Duke of Devonshire and Marquess of Hartington, 11th Earl of Devonshire, 3rd Earl of Burlington and Baron Cavendish of Keighley

Edward Cavendish
(1838–1891)

Charles Spencer Canning Boyle
(1861–1925)
10th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Robert John Lascelles Boyle
(1864–1934)
11th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

William Henry Dudley "Ginger" Boyle
(1873–1967)
12th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Victor Christian William Cavendish
(1868–1938)
9th Duke of Devonshire and Marquess of Hartington, 12th Earl of Devonshire, 4th Earl of Burlington and Baron Cavendish of Keighley

Edward William Spencer Cavendish
(1895–1950)
10th Duke of Devonshire and Marquess of Hartington, 13th Earl of Devonshire, 5th Earl of Burlington and Baron Cavendish of Keighley

Dorothy Evelyn Cavendish
(1900–1966)

Harold Macmillan
(1894–1986)

Patrick Reginald Boyle
(1910–1995)
13th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

John William Boyle
(1916–2003)
14th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

William John Robert Cavendish
(1917–1944)
styled Marquess of Hartington

Kathleen Kennedy
(1920–1948)

Andrew Robert Buxton Cavendish
(1920–2004)
11th Duke of Devonshire and Marquess of Hartington, 14th Earl of Devonshire, 6th Earl of Burlington and Baron Cavendish of Keighley

John Richard Boyle
(b. 1945)
15th Earl of Cork, Earl of Orrery, and Viscount Dungarvan

Peregrine Andrew Morny Cavendish
(b. 1944)
12th Duke of Devonshire and Marquess of Hartington, 15th Earl of Devonshire, 7th Earl of Burlington and Baron Cavendish of Keighley