55°01′28″N 6°56′17″W / 55.024437°N 6.938100°W / 55.024437; -6.938100Limavady Castle (Léim an Mhadaidh), also known as O'Cahans Castle, is a ruined castle in County Londonderry, Northern Ireland. It was once a stronghold of the O'Cahans.
In 1542, the MacQuillans, accompanied by James Butler, 9th Earl of Ormond, the Lord High Treasurer of Ireland and a large body of English, besieged and took the castle, slaughtering the whole garrison.[1]
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