Two entries with the name Luce.

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Luce

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A giant whose brother, Menedron, was slain by Guiron the Courteous.

Luce imprisoned Guiron in his castle in Sorelois for seven years to avenge the death.

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Source
Palamedes | c. 1240

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Luce

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A knight in the service of King Mark of Cornwall.

He led a battalion of Mark’s warriors against the invading Saxons, led by Helyas.

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Source
Prose Tristan | 1230-1240

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