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Roedd yr ynys yn anghysbell, ei phobl yn dlawd a'r amaethu'n ddigon cyntefig Ond er hynny fe ddechreuwyd gwerthu cig eidion Ynys M??n yn ol yn yr Oesoedd Canol, gan arlwyo bwrdd brenin ac uchelwyr yn eu tro A dyma'r porthmyn cyntaf yn cychwyn ar daith y canrifoedd ar y llwybrau unig Gyda'r blynyddoedd fe fu galw cyson am gig eidion campus yr ynys [A comprehensive and detailed account of the history of the Anglesey cattle drovers from the fourteenth to the twentieth centuries]