Two entries with the name Londres.

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Londres

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In La Tavola Ritonda, the capital of King Anguish of Ireland, father of Isolde.

In other sources, it is a variation of London.

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Source
La Tavola Ritonda | 1325–1350

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Londres

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A king after whom London was named. Londres was the father of Constantine, Arthur’s grandfather.

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Source
Unknown (the pre-Arthurian period) | Baudin Butor, c. 1290

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