Two entries with the name Cesar.

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Cesar

Cesaire

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Father of Vespasian, liberator of Joseph of Arimathea, in Robert de Boron’s Joseph d’Arimathie. He is replaced by Titus in the Vulgate Estoire del Saint Graal.

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Source
Joseph d’Arimathie | Robert de Boron, 1191–1202

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Cesar

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A bowman encountered by Arthur’s Sir Durmart during his adventures in Ireland. Cesar led Durmart to the city of Limerick, where Durmart’s paramour was under siege.

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Source
Durmart le Gallois | Early 13th century

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