Two entries with the name Lay of Tears.

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Lay of Tears

Lai de Plors

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A story of Joseph of Arimathea’s encounter with Orpheus the Enchanter, played to Sir Bors on his first visit to Corbenic (Carbonek).

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Source
Vulgate Lancelot | 1215-1230

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Lay of Tears

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A story written by Tristan after he was poisoned during his fight with Morholt.

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Source
Prose Tristan | 1230-1240

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See also
Lay | The Legend of King Arthur