|Cybi and Seiriol, not to scale|
As he was packing up, Cybi was challenged by Fintan to sail in a coracle that had no skin. That is to say, he was supposed to sail the skeleton of a small boat. Accepting this saint's challenge, he put to see on a bowl shaped skeleton of boards with nothing to hold the water out except the aid of the Lord. Again, we're not supposed to test God, but Cybi traveled to Anglesey with no problem. There, he took over an old Roman fort and opened a monastery -- Caer Gybi, or Cybi's Fort. He died in the monastery in 555.