A friendship between the two realms is retained long after Pwyll's death; in the fourth branch, Pryderi, Pwyll's son and lord of Dyfed has received a gift of otherworldly pigs from Arawn.
Exhausted from his journey, Crom falls asleep, and dreams a horrific encounter with Arawn, the king of the netherworld realm of Annwn.
Arawn |
In The High King Queen Achren (then sorceress) said that if Arawn were to go into Prydain unprotected and in his true form, he would be killed on sight so Arawn always employed his shape-shifting powers when in Prydain.
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In the first book in the series, Arawn sent his general, the evil Horned King, to amass a vast army with which to topple Caer Dathyl, the mightiest city in Prydain.
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In the final book, The High King, with the Horned King dead and the Crochan destroyed, Arawn's power seemed seriously depleted.
According to the Book of Taliesin, he fought alongside Gwydion at the Battle of the Trees, in which he assisted his uncle in enchanting the trees to rise up in battle against Arawn, king of Annwn.
Pwyll, the prince of Dyved, offends Arawn, ruler of Annwn (the underworld), by baiting his hunting hounds on a stag that Arawn's dogs had brought down.