The word "Mabinogi" originally designated only these four tales, which are really parts or 'branches' of a single work, ...

Pan oedd Pwyll yn Arberth ar adeg arall penderfynodd ddringo i gopa Bryn Arberth. Nodwedd y bryn hwnnw oedd y byddai pob tywysog a eisteddai ar ben y bryn naill ai'n cael anaf, neu'n cael gweld ...

Pwyll, Prince of Dyfed, is the hero of the first branch; his story is told in three distinct episodes. In the opening part he changes places with Arawn, the king of Annwn, for one year.

Mae tri gwall ym mhob darn. Chwilia am y gwallau a chywira nhw. Gwelodd pwyll yn syth ei fod wedi gwneud camgymeriad. Roedd y dyn ar gefn y ceffyl yn iawn. Nid cwn Pwyll oedd wedi lladd y carw ...