Two entries with the name Thoas.

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Thoas

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He was a young knight when he fought in the Noauz tournament, which Lancelot won. His shield was made in London and bore two swallows in flight.

Any firm identification with King Thoas of Ireland seems unlikely, especially considering that Chrétien also has the (unnamed) King of Ireland’s son fighting in the same tournament.

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Source
Cligés | Chrétien de Troyes, late 12th century

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Thoas

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A lord who hated the Knights of the Round Table. He imprisoned them whenever he found them. Claris and Laris defeated him and sent him to Arthur’s court as a prisoner.

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Source
Claris et Laris | 1268

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