A small slim lady, only five and a half feet tall, Rhiannon's most striking feature was her light blue, almost grey eyes that reminded people of the sea. Her hair was a dark auburn in colour and hung down past her waist. Rhiannon was the youngest daughter of a minor court noble, Baron Tremis. House Tremis was an old house but had very little power. When Rhiannon agreed to marry a Grand Duke, their fortune seemed on the rise. Unfortunally Rhiannon's new husband, Teridias did not play politics. Rhiannon was a shy girl who married the Duke at the young age of 21. She did attend some court functions, and even organised the odd Ball at Arden Manor as was required. But she prefered to spend most of her time in Arden with her husband. (Although she did enjoy Broceliande when she visited Deirdre with her husband.) Rhiannon and Teridias eventually had one son whom they called Pwyll. Unfortunally a short seven years after Pwyll's birth, both Rhiannon and Pwyll were killed by Roland Muis.