Glastonbury is a Saxon word (Glastingabiry) meaning "establishment of Glast"; the resulting misspelling was made possible by a faulty division of the name, so that it was seen as the English word glass.

In the time of the Britons, the area was known as Ynisgwtrin, or "Isle of Glass" (since Glastonbury was an island in the middle of a marshland.

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