Ireland; Co. Mayo; Clare Island: Granuaile's Castle (also: Grace O`Malley`s Castle; O`Malley`s Castle); 16th century. The castle is a tower house and protects Clare Island Harbour. Granuaile's Castle was built in the 16th century by the ?M醝lle (O'Malley); Kings of Umaill. It was a stronghold of Gr醝nne N?Mh醝lle (Grace O'Malley; c. 1530 - c. 1603); the famous "pirate queen." Her other strongholds were at Rockfleet Castle (on Clew Bay) and Carrickkildavnet Castle.In the 1820s the castle was converted into a police barracks; when the purple slate flashing was added to the two bartizans.