Adna mac Uthidir, Irish poet, fl.
Edward O'Reilly mentions him in his Chronological Account of Irish Writers.
[1] Fragments of laws attributed to Adna are to be found in the library of Trinity College.
The sages Adhna, Forchern, and Atharne are said to have been the first to collect the axioms of Irish law into one volume.
An old Irish tale "Immacallam in dá Thuarad" or 'The Colloquy of the Two Sages'[2] tells of his death.