"There was a single golden-framed
painting on the wall. It featured a
blonde mermaid who was fast
asleep on a rock, her long hair over her face.
—Description of the mermaid's portrait

A portrait of a Siren mermaid was located in the Prefects' bathroom in Hogwarts Castle. The portrait was set in a golden frame, and was noted to show off to people using the bathroom if she was awake. Myrtle Warren did not seem to like this portrait very much.


Sometime after 24 November, 1994, Cedric Diggory took his golden egg to the Prefects' bathroom to think it over. This portrait showed off for him as he thought, and it was partially due to its existence that he realised merpeople would be involved in the Second Task of the Triwizard Tournament.

On Diggory's suggestion, Harry Potter came to the bathroom later in the school year for the same reason. Despite the mermaid being asleep during his visit, it still helped him in coming to the same conclusion Diggory did.[1]

On the evening before Harry would go to the Second Task, he had a sort of nightmare that the mermaid was poking Harry with his broomstick, while he was in the water inside the portrait.

Behind the scenes

Siren Stained Glass GIF

The stained-glass window, in the film

  • In the film adaptation of Harry Potter and the Goblet of Fire, this is a moving stained-glass window instead of a portrait.
  • In LEGO Harry Potter: Years 1-4 she gets angry at Harry because he spilled all her water from the stained-glass window and throws scorpions at him. If you refill her portrait with water, she gives you the missing part of the sink.
  • It is unknown if the portrait was that of a real merperson or was simply a generic depiction of a mermaid.


Notes and references

  1. Harry Potter and the Goblet of Fire, Chapter 25 (The Egg and the Eye)
*Disclosure: Some of the links above are affiliate links, meaning, at no additional cost to you, Fandom will earn a commission if you click through and make a purchase. Community content is available under CC-BY-SA unless otherwise noted.

Fandom may earn an affiliate commission on sales made from links on this page.

Stream the best stories.

Fandom may earn an affiliate commission on sales made from links on this page.

Get Disney+