Earl of Glengall

Earl of Glengall was a title in the Peerage of Ireland that was created in 1816 for Richard Butler, 10th Baron Cahir. The subsidiary title of Baron Cahir (also spelt Caher) in the Peerage of Ireland was first created in 1542 for Thomas Butler, who was a descendant of The 3rd Earl of Ormond. James "Gallda" Butler (from Irish gallda 'alien or Englishman') (died 1434) was the son of the 3rd Earl and Catherine FitzGerald of Desmond. "Gallda" Butler married a daughter of MacWalter and together they had one son, Piers (1425-1464). The title was re-created in 1583 with the unusual remainder to heirs general of the first baron, which made his great-nephews, Theobald Butler and Thomas Prendergast, co-heirs. Prendergast ceded the title to Theobald Butler, preferring that the title should follow the strict male line.

The 10th Baron was created Viscount Cahir and Earl of Glengall. The titles of Viscount and Earl became extinct on the death of the second Earl in June 1858. The title of Baron Cahir, which was created with remainder to heirs general, became abeyant and could potentially be claimed by descendants of Thomas Prendergast.

Cahir is a town in the barony of Iffa and Offa West, County Tipperary. It is famous for Cahir Castle.

James "Gallda" Butler (from Irish gallda 'foreigner or Englishman') (died 1434) was the son of James Butler, 3rd Earl of Ormond and Catherine FitzGerald of Desmond. From him springs the Cahir branch of the Butler family who were ennobled as Barons Cahir. He married a daughter of MacWalter, and together they had one son, Piers (1425–1464).