Mac William Íochtar

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Lower Mac William
Mac William Íochtar
c. 1330–1602
County Mayo, c. 1590
Mac William Íochtar territory (dark green)
Vassals of Mac William Íochtar (light green)
Capital Kilmaine (inauguration site)
Languages Irish
Religion Roman Catholicism
Government Tanistry
 •  1332-1375 Edmond Albanach de Burgh
 •  1595-1602 Tiobóid mac Walter Ciotach Bourke
 •  Established c. 1330
 •  Disestablished 1602
Preceded by
Succeeded by
Arms of the House of de Burgh.svg House of Burke
County Mayo County Mayo coat of arms.png
Kingdom of Ireland Arms of Ireland banner (Historical).svg

Mac William Íochtar (Lower Mac William), also known as the Mayo Burkes, were a partly Gaelicised branch of the Hiberno-Norman House of Burke in Ireland. The territory covered much of the northern part of the province of Connacht. The Mac William Íochtar functioned as a regional king and received the White Rod. The title was a successor office to the Lord of Connacht which ended upon the assassination of William Donn de Burgh, 3rd Earl of Ulster, in June 1333.


As a result of the Burke Civil War of the 1330s, the Lordship of Connacht was split between two opposing factions of the de Burgh family: the Burkes of Mac William Uachtar (or Clanricarde) in southern Connacht and the Mac William Íochtar Bourkes of northern Connacht. For over three hundred years, the two families dominated the politics of the province, frequently fighting each other for supreme rule of both the Anglo-Irish and Gaelic-Irish peoples.

List of Mac William Íochtar[edit]

In 1594 Tibbot ne Long Bourke, one of the most prominent men in the country, accepted terms of surrender and regrant. In 1627 he was created Viscount Mayo.[1]

See also[edit]


  1. ^ Chambers A., Shadow Lord: Theobald Bourke, Tibbott-Ne-Long, 1567–1629: Son of the pirate queen Grace O'Malley (Ashfield Press, Dublin 2007) pp65-66.
  • Lower Mac William and Viscounts of Mayo, 1332-1649, in A New History of Ireland IX, pp. 235–36, Oxford, 1984 (reprinted 2002).