Casswallan was the son of Beli Mawr and Don Anna verch Mathonwy. The date and place of his birth have not been found.
His wife is not known. They were married, but the date and place have not been found. Their two known children were Llyr Llediarth (?-?) and Tenantius (?-?).
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Note 1
the leader of the Celtic tribes who repelled Caesar's invasions of 55 & 54 bc