I'd put them side by side, but your mileage may vary. Yes, Gwydion's usually assigned to Mercury, as Arianrhod is to the Moon. The other major characters in the story also have their planetary attributions. The full set is:
Jupiter: Math ap Mathonwy Mars: Gronw Pebr Sun: Llew Llaw Gyffes Venus: Blodeuwedd Mercury: Gwydion Moon: Arianrhod Earth/Saturn: Goewin
Pryderi is also the Sun, because mystically Llew is Pryderi after his initiation ("slaying" followed by rebirth). Gilfaethwy is also the Moon, which is always double.
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branchandroot
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Date: 2025-02-17 07:48 pm (UTC)Jupiter: Math ap Mathonwy
Mars: Gronw Pebr
Sun: Llew Llaw Gyffes
Venus: Blodeuwedd
Mercury: Gwydion
Moon: Arianrhod
Earth/Saturn: Goewin
Pryderi is also the Sun, because mystically Llew is Pryderi after his initiation ("slaying" followed by rebirth). Gilfaethwy is also the Moon, which is always double.