Two entries with the name Sesox.

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Sesox

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A heathen king slain by Gawain at the battle of the Diana Bridge.

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Source
Arthour and Merlin | Late 13th century

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Sesox

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A heathen warrior slain by Agravain at the battle in Logres.

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Source
Arthour and Merlin | Late 13th century

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