Gwyddno Garanhir
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In Welsh mythology, Lord Gwyddno Garanhir of Gwynedd was the father of Elphin. His name is Welsh and means Gwyddno Long-Shank. The basket of Gwyddno Garanhir is one of the Thirteen Treasures of Britain.
Gwyddno was said to be the lord of the Lowland Hundred (Cantre'r Gwaelod in Welsh). This was in what is now Cardigan Bay and was protected from the sea by floodgates which had to be shut before high tide. One day the keeper of the floodgates, Seithenyn, was drunk and failed to close them, with the result that the sea rushed in and covered the land.