Two entries with the name Coill.

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Coill

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According to Geoffrey, a king of Britain in the third or second century BC. He was the son of King Catell and the father of King Porrex.

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Source
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138

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Coill

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A first or second century king of Britain in Geoffrey’s chronicle.

The son of King Marius, Coill was raised in Rome and he dutifully recognized Rome’s sovereignty over Britain. He was succeeded by his son, Lucius the Glorious.

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Source
Historia Regum Britanniae | Geoffrey of Monmouth, c. 1138

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