Mac William Íochtar (Lower Mac William), also known as the Mayo Burkes, were a fully Gaelicised branch of the Hiberno-Norman House of Burgh in Ireland. Mayo covered much of the northern part of the province of Connacht and 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.
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History
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 Burkes 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
Edmond Albanach de Burgh, 1st Mac William Íochtar (1332–1334), died November 1375
Thomas mac Edmond Albanach de Búrca, 2nd Mac William Íochtar (1375–1402)
Walter mac Thomas de Búrca, 3rd Mac William Íochtar (1402– 7 September 1440)
Edmund na Féasóige de Búrca, 4th Mac William Íochtar (1440–1458)
Tomás Óg de Búrca, 5th Mac William Íochtar (1458–1460)
Risdeárd de Búrca, 6th Mac William Íochtar (1460–1469), died 1473
Ricard Ó Cuairsge Bourke, 7th Mac William Íochtar (1469–1473), died 1479
Theobald Bourke, 8th Mac William Íochtar (1479–5 March 1503)
Ricard Bourke, 9th Mac William Íochtar (1503–7 July 1509)
Edmond de Búrca, 10th Mac William Íochtar (1509–23 February 1514)
Meiler Bourke, 11th Mac William Íochtar (1514–28 April 1520)
Edmond de Búrca, 12th Mac William Íochtar (1520–29 September 1527)
Seaán an Tearmainn Bourke, 13th Mac William Íochtar (1527–?)
Theobald mac Uilleag Bourke, 14th Mac William Íochtar (?–1537)
David de Búrca, 15th Mac William Íochtar (1537–?)
Ricard mac Seaán an Tearmainn Bourke, 16th Mac William Íochtar (?–1571)
Seaán mac Oliver Bourke, 17th Mac William Íochtar (1571–1580) and Baron Ardenerie (1580)
Richard the Iron Bourke, 18th Mac William Íochtar (1580–1582)
Richard Bourke, 19th Mac William Íochtar (1582–1586)
William "the Blind Abbot" Bourke, 20th Mac William Íochtar (1586–Abolition, 1593)
Tibbot MacWalter Kittagh Bourke, 21st Mac William Íochtar (Restoration, December 1595–March 1601) and Marquess of Mayo (Peerage of Spain, 1602)
Richard "the Devils Hook" Bourke, 22nd Mac William Íochtar (March 1601–October 1601)
Tibbot ne Long Bourke, 23rd Mac William Íochtar (October 1601–Abolition, January 1602) and Viscount Mayo (1637)
In 1594, Tibbot ne Long Bourke, one of the most prominent men in the country and son of Richard "the Iron" Bourke, 18th Mac William Íochtar (d.1582), accepted terms of surrender and regrant. In 1627, he was created Viscount Mayo.