About Dian mac Rotheachta, Prince of Ireland
Dian King of Ireland
Rotheachtach King of Ireland (-1357bc)
was kept out of the Monarchy by his father's slayer, and his son. In his time gentlemen and noblemen first wore gold chains round their necks, as a sign of their birth ; and golden helmets were given to brave soldiers.
Part III, Chapter IV of Irish Pedigrees, by John O'Hart, published 1892, pages 351-9, 664-8 and 708-9.