 The Llanmaes suffered during the rebellion of Madog ap Llywelyn (129495), at the end of which Edward I visited Llanfaes and ordered the construction of the new castle and town of Beaumaris nearby as part of his pacification campaign.The nearby site of Porth y Wygyr ("Vikingport") or Cerrig y Gwyddyl ("Irishstone") was chosen and Edward evicted Llanmaes's Welsh population to the opposite coast of the island, turning Rhosyr into "Newborough".Beaumaris then appropriated Llanmaes's former ferry and coastal trade.