Dubthach maccu Lugair, legendary Irish poet and lawyer in the time of St Patrick
Dubhthach gave a judgement against King Loegaire for killing Patrick's charioteer, Saint Odran.
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Another poem beginning "Tara the house in which lived the son of Conn", found in the Book of Rights, and also assigned to him by O'Reilly, is there said to be the composition of Benen or Benignus.
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Their meeting took place at Domnach-már-Criathar, now Donaghmore, near Gorey, county Wexford, and St. Patrick inquired whether he had among his "disciples" any one who was "the material of a bishop, whose qualifications are enumerated in the Book of Armagh".