Carrickkildavnet castle was built c. 1429 by the Ó Máille (O'Malley), Kings of Umaill. It was later the stronghold of Gráinne Ní Mháille (Grace O'Malley, c. 1530 – c. 1603), the famous "pirate queen." Her other strongholds were at Rockfleet Castle (on Clew Bay) and Clare Island.