Doon Castle (Irish: Caisleán an Dúin, meaning 'Fort Castle') was a fortified dwelling situated on a hill in the townland of the same name, in the parish of Aughagower, approximately four miles from Westport in County Mayo.
In 1133, Cormac MacCarthy and Conor O'Brien invaded Connaught and plundered much of the country, destroying Dún Mughdhord (Doon Castle) and Dunmore.
[2] According to local accounts, the stones of the castle were used by Lord Sligo in the building of Westport House.
[2] The space between the main castle and the outer fortifications was not great.
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