NIGHTBRINGER | The Arthurian Encyclopedia

Thyle


An enchanted island, deep in an unknown sea.

The lady-turned-dragon Clidra came from this island, which had marvelously long days in the summer, and extremely short ones in the winter. Some scholars have sought to identify it with the Roman mythological island of Pliny.


Source
Lanzelet | Ulrich von Zatzikhoven, c. 1200