Confederate Ireland
Oranmore Castle was most likely built some time around the 15th century, possibly on top of an older castle. The Clanricardes, a notable family from Galway, used it as a stronghold. In March 1642 the town, Oranmore, joined Confederate Ireland in a rebellion, against which the owners of the castle, the Marquess and the fifth Earl Clanricarde, held out. Clanricarde supplied the Fort of Galway from the sea until 1643, when, without the Marquess's sanction, Captain Willoughby Governor of Galway surrendered.