Marquess of Ailsa
|Marquessate of Ailsa|
Arms of Kennedy, Marquesses of Ailsa: Argent, a Chevron Gules, between three crosses-Crosslet fitchée Sable, the whole within a Double-Tressure flory counterflory of the second. Crest: A Dolphin naiant proper. Supporters: On either side a Swan wings inverted proper, beaked and membered Gules
|Creation date||10 September 1831|
|Peerage||Peerage of the United Kingdom|
|First holder||Archibald Kennedy, 1st Marquess of Ailsa|
|Present holder||David Kennedy, 9th Marquess of Ailsa|
|Heir apparent||Archibald Kennedy, Earl of Cassilis|
|Remainder to||The 1st Marquess' heirs male of the body lawfully begotten|
|Subsidiary titles||Earl of Cassilis |
|Former seat(s)||Culzean Castle|
|Armorial motto||AVISE LA FIN |
(Consider the end) 
Marquess of Ailsa, of the Isle of Ailsa in the County of Ayr, is a title in the Peerage of the United Kingdom. It was created on 10 September 1831 for Archibald Kennedy, 12th Earl of Cassilis. The title Earl of Cassilis (pronounced "Cassels") had been created in 1509 for the 3rd Lord Kennedy. This title had been created in the Peerage of Scotland in 1457. The 1st Marquess had been created Baron Ailsa in the Peerage of the United Kingdom on 12 November 1806.
Lords Kennedy (1457)
- Gilbert Kennedy, 1st Lord Kennedy (c. 1406–c. 1480)
- John Kennedy, 2nd Lord Kennedy (died 1508)
- David Kennedy, 3rd Lord Kennedy (died 1513) (created Earl of Cassilis in 1509)
Earls of Cassilis (1509)
- David Kennedy, 1st Earl of Cassilis, 3rd Lord Kennedy (1463-1513)
- Gilbert Kennedy, 2nd Earl of Cassilis, 4th Lord Kennedy (died 1527)
- Gilbert Kennedy, 3rd Earl of Cassilis, 5th Lord Kennedy (1515–1558)
- Gilbert Kennedy, 4th Earl of Cassilis, 6th Lord Kennedy (c. 1541–1576)
- John Kennedy, 5th Earl of Cassilis, 7th Lord Kennedy (c. 1573–1615)
- John Kennedy, 6th Earl of Cassilis, 8th Lord Kennedy (died 1668)
- John Kennedy, 7th Earl of Cassilis, 9th Lord Kennedy (1653-1701)
- John Kennedy, 8th Earl of Cassilis, 10th Lord Kennedy (1700–1759)
"From 1759 to 1762 the titles and estates were in dispute between the heir male and the heir general. The latter, William [Douglas], Earl of Ruglen and March later Duke of Queensberry, was son and heir of William [Douglas], Earl of March, by his wife Anne [Hamilton], suo jure Countess of Ruglen, 1st dau. and heir of line of John [Hamilton], Earl of Selkirk and Ruglen, by his first wife Lady Anne Kennedy, the only daughter that had issue of John [Kennedy], 7th Earl of Cassillis. He claimed the estates under an entail of 5 September 1698, which he contended could not be set aside by the entail of 1759. The entail of 1759 was however upheld, though by a narrow majority, in the Court of Session, and confirmed, on appeal, by the House of Lords. He then, under the designation of "William, Earl of Cassillis, Ruglen and March" claimed "the titles and honours of Earl of Cassillis and Lord Kennedy," on the ground of certain charters of 24 April 1641 and 29 September 1642. Sir Thomas Kennedy, Bart., claimed the said titles as heir male, and the two petitions having been laid before the House of Lords, it was adjudged, 27 January 1762, that the latter had a right "to the honour and dignity of Earl of Cassillis as heir male of the body of David, the 1st Earl of Cassillis, and [to that] of Lord Kennedy as heir male of the body of Gilbert, the 1st Lord Kennedy.""
- Thomas Kennedy, 9th Earl of Cassilis, 11th Lord Kennedy (died 1775), previously the 4th Baronet of Culzean
- David Kennedy, 10th Earl of Cassilis, 12th Lord Kennedy (died 1792)
- Archibald Kennedy, 11th Earl of Cassilis, 13th Lord Kennedy (died 1794)
- Archibald Kennedy, 12th Earl of Cassilis, 14th Lord Kennedy (1770–1846) (created Baron Ailsa in 1806 and Marquess of Ailsa in 1831)
Marquesses of Ailsa (1831)
- Archibald Kennedy, 1st Marquess of Ailsa, 12th Earl of Cassilis, 14th Lord Kennedy, 1st Baron Ailsa (1770–1846)
- Archibald Kennedy, 2nd Marquess of Ailsa, 13th Earl of Cassilis, 15th Lord Kennedy, 2nd Baron Ailsa (1816–1870)
- Archibald Kennedy, 3rd Marquess of Ailsa, 14th Earl of Cassilis, 16th Lord Kennedy, 3rd Baron Ailsa (1847–1938)
- Archibald Kennedy, 4th Marquess of Ailsa, 15th Earl of Cassilis, 17th Lord Kennedy, 4th Baron Ailsa (1872–1943)
- Charles Kennedy, 5th Marquess of Ailsa, 16th Earl of Cassilis, 18th Lord Kennedy, 5th Baron Ailsa (1875–1956)
- Angus Kennedy, 6th Marquess of Ailsa, 17th Earl of Cassilis, 19th Lord Kennedy, 6th Baron Ailsa (1882–1957)
- Archibald David Kennedy, 7th Marquess of Ailsa, 18th Earl of Cassilis, 20th Lord Kennedy , 7th Baron Ailsa(1925–1994)
- Archibald Angus Charles Kennedy, 8th Marquess of Ailsa, 19th Earl of Cassilis, 21st Lord Kennedy, 8th Baron Ailsa (1956–2015)
- David Thomas Kennedy, 9th Marquess of Ailsa, 20th Earl of Cassilis, 22nd Lord Kennedy, 9th Baron Ailsa (born 1958)
The heir apparent is the present holder's son Archibald David Kennedy, Earl of Cassilis (born 1995).
- Debrett's Peerage, 1876, p.16
- Debrett's Peerage, 1876, p.16
- "No. 18846". The London Gazette. 9 September 1831. p. 1833.
- Cokayne 1910, p. 67.
- "No. 15971". The London Gazette. 4 November 1806. p. 1438.
- [permanent dead link]
- [permanent dead link]
- The Complete Peerage, vol. III, pp 78 – 79
- Cokayne, George E. (1910). Gibbs, Vicary, ed. The complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant. I, Ab-Adam to Basing. London: St. Catherine Press. pp. 67–68.
- Cokayne, George E. (1998). Hammond, Peter W., ed. The complete peerage of England, Scotland, Ireland, Great Britain and the United Kingdom, extant, extinct, or dormant. XIV, Addenda and Corrigenda. London: St. Catherine Press. pp. 12–13.
- Leigh Rayment's Peerage Pages [self-published source][better source needed]
- The Rulers of Strathspey, a history of the lairds of Grant and the Earls of Seafield, 1911, by the Earl of Cassilis