The Battle of Knockdoe was a conflict between the Hiberno-Norman de Burghs (Burkes) and Anglo-Norman Fitzgeralds, along with their respective Irish allies. On 19 August 1504, the Parish of Lackagh (Irish Leacach) was the site of what appears to have been an unusually bloody conflict, arising from a dispute between Maelsechlainn mac Tadhg Ó Cellaigh (Mod. Irish Maoilseachlainn mac Thaidhg Uí Cheallaigh), King of Ui Maine – Mod. Irish Uí Mháine) and Ulick Fionn Burke, the Clanricarde.