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Callan was a constituency represented in the Irish House of Commons until 1800. It was established by royal charter in 1585, apparently at the request of Thomas Butler, 10th Earl of Ormond. He was a cousin of Elizabeth I on her mother's side, and one of the few Irish leaders in whom she had complete trust. It was very much a Butler "family borough", whose seats were held by families like the Comerfords, who were Butler clients.
^ abcParliamentary Papers, Volume 62, Part 2. p. 620.
Bibliography
O'Hart, John (2007). The Irish and Anglo-Irish Landed Gentry: When Cromwell came to Ireland. Vol. II. Heritage Books. ISBN978-0-7884-1927-0.
Leigh Rayment's historical List of Members of the Irish House of Commons. Cites: Johnston-Liik, Edith Mary (2002). The History of the Irish Parliament 1692-1800 (6 volumes). Ulster Historical Foundation.