Theobald Bourke 8th Mac William Iochtar
Teabóid Búrca
Arms of Bourke of Mayo[1]
Died	1503

Theobald Bourke, 8th Mac William Iochtar (English: /bɜːrk/; BURK; died 1503) was an Irish chieftain and noble who succeeded his cousin (who retired in 1473) as lord of Lower (North) Connacht, Ireland.

Theobald was the son of Walter mac Thomas de Búrca (Walter Bourke), 3rd Mac William Iochtar (d.1440). In 1473, he succeeded his cousin, Ricard Ó Cuairsge Bourke, 7th Mac William Íochtar (d. 1479) as chieftain. Theobald was succeeded by his brother, Ricard Bourke, 9th Mac William Íochtar (d.1509).^[2]

From the Annals of the Four Masters:

• M1480.14. A spirited engagement took place between the sons of Edmond Burke and the sons of Richard Burke, in which the sons of Edmond were routed; and the son of Mac Dowell Mac Dugald of Scotland, i.e. Colla, was slain by one cast of a dart, and many others were slain along with him.
• M1486.15. An army was mustered by O'Donnell, and marched into Tirawley. The Lower Mac William went to oppose him; and a battle was fought between them, in which upwards of one hundred of Mac William's people were slain, and John Mac Jordan, Ulick, the son of Richard, son of Thomas Burke, with many others, were taken prisoners.
• M1487.26. Edmond, the son of Richard Burke, was treacherously taken prisoner by the Barretts, but was afterwards triumphantly rescued by his kinsmen.
• M1488.28. A peace was concluded between O'Donnell and Mac William Burke, O'Conor and Mac Dermot being as sureties and guarantees between them.^[3]

• House of Burgh, an Anglo-Norman and Hiberno-Norman dynasty founded in 1193

• Burke, Bernard (1884). The General Armory of England, Scotland, Ireland, and Wales; comprising a registry of armorial bearings from the earliest to the present time. University of California Libraries. London: Harrison & Sons.
• Knox, Hubert T. (1908). The History of the County of Mayo to the close of the sixteenth century. Dublin: Hodges, Figgis and Company. p. 395.
• Moody, T. W.; Martin, F. X.; Byrne, F. J., eds. (1989). A New History of Ireland: IX: Maps, Genealogies, Lists, A Companion to Irish History, Part II. Oxford: Oxford University Press. ISBN 978-0-19-959306-4.
  • Lower Mac William and Viscounts of Mayo, 1332-1649, pp. 235–36.
• Annala Rioghachta Eireann: Annals of the kingdom of Ireland by the Four Masters, from the earliest period to the year 1616. Edited from MSS in the Library of the Royal Irish Academy and of Trinity College Dublin with a translation and copious notes. Vol. 5. Translated by O'Donovan, John (1st ed.). 2016 [1851]. Retrieved 11 March 2019.

• Annals of the Four Masters

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