The stories of y Ddraig are based on real characters of history, myth or literature and, thus, some places in the stories are real. Caer Gai (known as Caer Gynyr in ‘Sacrifice’ but Caer Gai by ‘Ascension’) did exist on the banks of Lake Bala in Northern Wales. Melangell’s valley is still as beautiful and peaceful as ever it was. All of those places have a real and important part in the original tales of Melangell and Cai. Eryri (Snowdonia) is a phenomenal and mystery-drenched highlands in the north of Wales, Mathraval was a real land and power centre in the 5th and 6th Century, and Crug Eryr was an actual stronghold of the era. I have used those locations in the weaving of ‘Sacrifice’.
Here’s a map to keep it all straight.