At its largest extent, the Kings of Síol Anmchadha ruled all the land on the west shore of Lough Derg (Shannon) as far south as Thomond; the land between the Shannon and Suck rivers; and a corridor of land, known as Lusmagh, across the Shannon in Munster, in the direction of Birr.
The ruling dynasty later took the surname Ó Madadháin, anglicised as Maddan or Madden. In the later medieval era they were sometime vassals of the Earl of Ulster and their successors, The Clanricardes.
In 1651, after the area had been incorporated into the Kingdom of Ireland, land belonging to the Madden, Kelly, Burke and other families was appropriated during the Cromwellian conquest of Ireland. In particular, the English brothers John Eyre and Edward Eyre took much land. "Eyrecourt" in the area is named after them (it was originalled called Dún an Uchta) and their descendant became Baron Eyre.
- Kings of Síol Anmchadha
- Uí Maine
- Clann Fhergail
- Uí Fiachrach Aidhne
- Clann Taidg
- Conmhaícne Mara
- Muintir Murchada
- Trícha Máenmaige
- Uí Díarmata
- O'Madáin: History of the O'Maddens of Hy-Many, Gerard Madden, 2004. ISBN 0-9529511-7-7.
- The Colahans - A Remarkable Galway Family, Diarmuid Ó Cearbhaill, Journal of the Galway Archaeological and Historical Society, volume 54, 2002, pp. 121–140.
- Medieval Ireland: Territorial, Political and Economic Divisions, Paul MacCotter, Four Courts Press, 2008, pp. 133–134. ISBN 978-1-84682-098-4
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