Irish angler uses Magna Carta on landowner By Tom Peterkin, Ireland Correspondent Last Updated: 1:47am BST 14/04/2007 The Duke of Devonshire's ownership of Ireland's most prolific salmon river is to be challenged by an angler in a landmark court case that evokes the historic tensions between the English aristocracy and the Irish. Michael O'Shea will cite the 1215 Magna Carta signed by King John to argue that he has the right to fish the Blackwater as he attempts to overturn a poaching conviction. His case will question the Devonshires' entitlement to the river, which is on the border of Co...