The Barony of Dunboyne was created by patent in the Peerage of Ireland

Peerage of Ireland

The Peerage of Ireland is the term used for those titles of nobility created by the English and later British monarchs of Ireland in their capacity as Lord or King of Ireland. The creation of such titles came to an end in the 19th century. The ranks of the Irish peerage are Duke, Marquess, Earl,...

 in 1541. The barons are alternately numbered from the early 14th century by numbers ten greater than the number dating to the patent (e.g. the 28th/18th Baron Dunboyne died May 19, 2004). The first baron of this sequence in turn married the heiress to an earlier line of Barons Dunboyne.

Barons Dunboyne (1324)

• Thomas Butler, 1st Baron Dunboyne
  Thomas Butler, 1st Baron Dunboyne
  Thomas Butler, 1st Baron Dunboyne was the third son of Theobald Butler, 4th Chief Butler of Ireland and Joan FitzJohn.-Marriage and issue:He married Synolda le Petit, daughter of William le Petit...
  
   (d. 1329)
• Pierce (Piers)Butler, 2nd Baron Dunboyne (d. 08/05/1370)
• Thomas "MacPiarais" Butler, 3rd Baron Dunboyne (d. 11/07/1370)
• William Butler, 4th Baron Dunboyne (d. 1406)
• Pierce Butler, 5th Baron Dunboyne (d. 1415)
• Edmond Butler, 6th Baron Dunboyne (d. 1419)
• James Butler, 7th Baron Dunboyne (d. 1445)
• Edmond Butler, 8th Baron Dunboyne (d. 1498)
• James Butler, 9th Baron Dunboyne (d. 1508)
• James Butler, 10th Baron Dunboyne (d. 1538)

Barons Dunboyne (1541)

• Edmond Butler, 1st/11th Baron Dunboyne (d. 1566), elevated to the peerage on 11/06/1541.
• James Butler, 2nd/12th Baron Dunboyne (d. 1624)
• Edmond Butler, 3rd/13th Baron Dunboyne (d. 1640)
• James Butler, 4th/14th Baron Dunboyne (d. 1662)
• Pierce Butler, 5th/15th Baron Dunboyne (d. 1690)
• James Butler, 6th/16th Baron Dunboyne (d. 1701)
• Pierce Butler, 7th/17th Baron Dunboyne (d. 1718)
• Edmond Butler, 8th/18th Baron Dunboyne (d. 1732)
• James Butler, 9th/19th Baron Dunboyne (d. 1768)
• Pierce Butler, 10th/20th Baron Dunboyne (d. 1773)
• Pierce Edmond Creagh Butler, 11th/21st Baron Dunboyne (d. 1785)
• John Butler, 12th/22nd Baron Dunboyne
  John Butler, 12th Baron Dunboyne
  John Butler, 12th Baron Dunboyne was an Irish clergyman and aristocrat, Roman Catholic Bishop of Cork. In order to advance his temporal title, he became, , the only authenticated apostate in the Catholic hierarchy in Ireland.-Early life:...
  
   (1720–1800)
• James Butler, 13th/23rd Baron Dunboyne (1780–1850)
• Theobald Fitzwalter Butler, 14th/24th Baron Dunboyne (1806–1881) (elected a Representative Peer in 1868)
• James Fitzwalter Clifford-Butler, 15th/25th Baron Dunboyne (1839–1899)
• Robert St John Fitzwalter Butler, 16th/26th Baron Dunboyne (1844–1913) (elected a Representative Peer in 1901)
• Fitzwalter George Probyn Butler, 17th/27th Baron Dunboyne (1874–1945)
• Patrick Theobald Tower Butler, 18th/28th Baron Dunboyne (1917–2004) (Headed the Irish Peers Association)
• John Fitzwalter Butler, 19th/29th Baron Dunboyne (b. 1951)

The heir apparent

Heir apparent

An heir apparent or heiress apparent is a person who is first in line of succession and cannot be displaced from inheriting, except by a change in the rules of succession....

is the present holder's only son, Richard Pierce Theobald Butler (b. 1983)