A fish, the moon, and a tower

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Almost all the vassals of the counts of Foix were "Sons of the Moon" (or "Sons of Belissena" as they also called themselves). They claimed to be descended from the moon goddess Belissena, the Celt Iberian Astarte. On their shields were a fish, the moon, and a tower — the emblems of the moon goddess, the sun god, and the power of the knights.

Otto Rahn. Crusade Against the Grail.