Hengroen was a stallion owned by King Arthur, according to the Welsh tale Culhwch and Olwen.[1] [2]
. The Mabinogion: The Red Book of Hergest . Lady Charlotte Guest . 2007 . Forgotten Books . 978-1-60506-164-1 . 199 .
. The encyclopedia of Celtic mythology and folklore . Patricia Monaghan . 2004 . Infobase Publishing . 0-8160-4524-0 . 244 .