Llyn Cau

I heard the story about a shoemaker tricking a husband and wife pair of giants who wanted to settle on the island. The wife was carrying a massive pile of stones in her apron, supposedly to help build a shelter for them while they terrorised their locality. The brutes approached the frightened and small shoemaker, the husband snarling when he said that they were looking for a place to settle. He asked 'oh uhhhh whereabouts then?' to which they replied 'Anglesey'. 

Although frightened by the pair, he quickly caught on that they had no idea that they were, in fact, right where they wanted to be! So he came up with a plan to trick the pair. He asked then to follow him and led them across the island towards the coast and pointed to Ireland, saying 'if it's Anglesey you are looking for, then there it is over there'. 

This trick worked, the giants were caught unaware and were furious. The giants wife, in a huff, turned to his husband and yelled there was no way she was going to swim across the sea with all these stones in her apron and so dumped them on the coast. 

Both giants, feeling dejected, left the island never to be seen again.