Copenhagen and Warsaw - the two sisters

In times of old, in the depths of the Baltic, lived two sisters - half fish, half women. Both of great beauty. One day, they came ashore and emerged from the foamy waters of the sea. One sister resolved to swim to Danish straits, where she lives today. We can see her sitting on a rock at the entrance to the port of Copenhagen.

The other mermaid swam to Gdansk - a small town by the sea, from where she moved up the river Vistula (Wisla). Legend has it that she came out of the water to a sandy bank, at the foot of today’s Old Town of Warsaw, to take a rest. As she liked the place, she decided to stay.
Consequently, fishermen from the nearest village noticed that whenever they went fishing, someone churned up the river, tangled up their net and set fish free. Thus, they resolved to capture the pest and punish it. But as soon as they heard the mermaid’s beautiful voice, they gave up the idea of doing any harm to her. What is more, they truly came to love this gorgeous woman-fish, who, since that moment, adorned every evening with her wonderful songs.
Then, one day, a rich merchant walking along the shore saw the woman with fish’s tail. The idea occurred to him that he could catch the creature, imprison her and show for money on fairs. He did as he thought. By using a trick he captured the mermaid and incarcerated her in a wooden shed. Fortunately, her cries for help were heard by a fisherman’s young son, who, assisted by friends, set the mermaid free.

The half woman half fish, grateful for the rescue, promised to defend them whenever they called. Since that day, Warsaw's mermaid armed in a sword and shield protects the city and its inhabitants.
She doesn't seem to be that scary, though. ^_^