Geoffrey makes Cligueillus/Digueillus/Eligueillus the father of Heli and grandfather of Lud, (the prototype of Lludd), Cassibellaunus, and Nennius.
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Geoffrey's Cligueillus / Digueillus may be a corruption of the Old Welsh name Higuel (specifically, the 10th century AD king Higuel (Howel/Houuel) Bonus - i.e. Hywel Dda - mentioned in one of Geoffrey's sources, the Annales Cambriae, now Modern Welsh Howell.
In the Mabinogion tale of Lludd and Llefelys, which seems heavily influenced by Geoffrey of Monmouth's work, he is the ruler of Britain while his brother Llefelys ruled Gaul.