Lyonnesse

[ lahy-uh-nes ]
/ ˌlaɪ əˈnɛs /

noun Arthurian Romance.

the mythical region where Sir Tristram was born, located near Cornwall in SW England and supposed to have been submerged by the sea.

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British Dictionary definitions for lyonnesse

Lyonnesse
/ (ˌlaɪəˈnɛs) /

noun

(in Arthurian legend) the mythical birthplace of Sir Tristram, situated in SW England and believed to have been submerged by the sea