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The descendants of Tomas Mór O'Reilly, king of East Breifne 1384-92, were rulers of Clanmahon in the 15th century; Tomás was the son of Mathgamain Ua Raighillaigh. The Uí Shioradáin (O'Sheridans) were a vassal tribe. The Ua Raghallaigh (O'Reillys) were also powerful landowners until the 16th century. According to the Annals of the Four Masters, in 1537, "The son of O'Reilly (Brian, the son of Farrell), a great

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