A history of the island of Mona, or Anglesey [electronic resource] : including an account of its natural productions, Druidical antiquities, lives of eminent men, the customs of the court of the antient Welsh princes, &c. : being the prize essay to which was adjudged the first premium at the Royal Beaumaris Eisteddfod, held in the month of August, 1832 / by Angharad Llwyd