Cuthbert was a giant well known in peculiar folk lore. His story was a cover for Balenciaga Wren's Menagerie, who used a giant stone as her loop entrance, and had her peculiar animals live on the tall mountain beside it.
Tales of the Peculiar[]
Cuthbert was one of a small number of giants still left in the world. He was a kind, soft-spoken giant who helped many peculiar animals escape death from hunters by bringing them onto a mountain. In the tale, he helps an emu-raffe get away from hunters and kills the hunter for good measure. All the other peculiar animals want to be safe as well, so he brings them to safety atop a mountain as well. Later on, a witch comes and turns him to stone for killing the hunter. He begs the animals he has saved to come down from the mountain and talk to him, but they dare not, as they will be in danger if they do so. They attempt to talk to him from the safety of the mountain, but go unheard, and Cuthbert is still crying when his throat turns to stone like the rest of him.
In Millard Nullings's ending of the tale, the animals, feeling guilty, climb down the mountain and talk to Cuthbert until his lips and throat turn to stone. The emu-raffe finds that Cuthbert is still alive under the stone skin, and the animals become his caretakers, finding refuge inside him as well. He peacefully passes away many years later, and is made the loop entrance of Miss Wren'sloop.
Hollow City[]
In Hollow City, in order to keep Claire Densmore calm so she wouldn't draw attention from wights, it suggested that a story is told. Caul Bentham, who was hiding as his sister Alma Peregrine, flipped to the story so that it would be read aloud. He knew that it was based off of Balenciaga Wren's Menagerie, so he did it in order for them to help find the loop.
The next morning, they find the giant stone, and realized what it actually was; a loop entrance.

Miss Wren's loop entrance: the basis for the tale