A collection of records relating to the ownership and management of the largest estate in Co Mayo, centred on the town of Westport and belonging to the Browne family, Earls of Altamont and Marquesses of Sligo, covering the 16th-20th centuries. Much of the Brownes<U+2019> title to their estate was derived from the Bourke family, Viscounts Bourke of Mayo and the collection is unique because of the material it contains relating to land tenure in Co Mayo in the 17th century. There is also documentation concerning the part played by Colonel John Browne in the Jacobite War 1689-91. Most of the remainder of the collection consists of 19th and 20th century estate administration records. Some family papers are also included.

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