Gaste Citié
A supernatural, ruined city in Perlesvaus. Lancelot visited the Waste City and was challenged to a Beheading Game by one of the residents. By honoring his pledge to return in a year and face death, Lancelot ended a curse and saved the Waste City and its people.
In the Fourth Continuation of Chrétien’s Perceval, the king of the Waste City attacks Gornemant of Gohort, but is driven away by Perceval.
Source
Perlesvaus | Early 13th century