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.
- 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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