Wikipedia
Pwyll Pen Annwn is a prominent figure in Welsh mythology and literature, the lord of Dyfed, husband of Rhiannon and father of the hero Pryderi. He is the eponymous hero of Pwyll Pendefig Dyfed, the first branch of the Four Branches of the Mabinogi, and also appears briefly as a member of Arthur's court in the medieval tale Culhwch ac Olwen. Pwyll, Prince of Dyfed also carries many similarities to the Mabinogi Branwen.
The impact crater Pwyll (named after the Pwyll of Welsh mythology) is thought to be one of the youngest features on the surface of Jupiter's moon Europa.
Pwyll's visible dark central region is about 26 kilometers in diameter, with a central peak rising to about 600 meters.
Brilliant rays of debris blasted from the impact site extend outward for hundreds of kilometers. The white debris or ejecta clearly overlays everything else on the surface - indicating that this impact crater is younger than all surrounding features. The bright white color suggests a composition of water ice particles.