The Amaethon reference article from the English Wikipedia on 24-Apr-2004
(provided by Fixed Reference: snapshots of Wikipedia from wikipedia.org)

Amaethon

In Insular Brythonic mythology, Amaethon was a god of agriculture, a son of Don and Beli.

He stole a dog, lapwing and roebuck from Arawn, leading to the Battle of Cath Godeau between the underworld gods and monsters and the children of Don. In this battle, Amaethon's brother, Gwydion, turned trees into warriors that helped the children of Don win.