Werehorses

Mythic History
The Ceffyl-ddyn also called the Ceffyl dŵr were not actually born from Gwydion & Gilfaethwy. They are an older race, created by the sea god Llŷr to serve as companions for his four children by the goddess Penarddun (daughter of Belenos & Dôn). As such, they were devoted to Pwyll, Rhiannon, Nisien and Efnysien. During the Cad Goddeu, they fought on the side of Arawn and Pyerdi. When Pyerdi was killed by Gwydion, Gwydion claimed Pyerdi's white mare Seovaghnan for himself and bound her with a golden bridle, gifting to her to Emrys Wledig, the son of Llew Llaw Gyffes and Nemetona.

Before the Age of Saints
Most of the Ceffyl-ddyn favored tricking humans into trying to ride them and then galloping into a lake or the ocean and drowning them as sacrifices to Llŷr or to serve the fey or Arawn. They were also known as Kelpies in Ireland and Scotland. Ceffyl-ddyn did not typically breed with humans; their lovers were generally either fey or sometimes ordinary horses. The children of the Ceffyl-ddyn and fey became the pooka and generally remained in the otherworld when not playing with humans for sport. The foals of ordinary mares sired by Ceffyl-ddyn stallions became Ceffyl-ddyn; they were often born looking like an six or seven year old child and able to shapeshift almost immediately.

Emrys Wledig was an ally of Constans the Wolf King and later favored Arthur and the Bleidd-dyn wolf kings of the Summerlands. He gave Seovaghnan to Aurelius Constantine, the son of Vortigen & Constans daughter Blodwen and she became the companion/advisor to the Grail Kings of the Summerlands therafter.

During the War of Salt & Silver
Because of thier antagonistic nature towards humans, the Ceffyl-ddyn were favorite targets of the saints. Those that did not escape into the otherworld were killed and they were believed to be driven to extinction (with the exception of immortal Seovaghnan) during the early Interregnum.

The Bygone War
The Ceffyl-ddyn and the pooka emerged from the otherworld as the steed-companions of the fey nobility. Few in number, their hatred towards humans in general and Christians in specific was as savage as the Bleid-ddyn. They began to breed with mundane horses, creating a new generation to frequent the lakes, rivers and cliffsides of the Three KIngdoms. Seovaghnan is treated by her own kind with the deepest reverence despite her more tolerant views towards human kind.

The Diva
The witch Blodeuedd emerged from otherworld with the curse placed upon her broken. In the mid 1800s, she succeeded capturing several ceffyl-ddyn and pooka and started breeding them with humans on Sully Island and the nearby mainland, her claimed domain in the Vale of Glamorgan. She's taken over the hamlet of Swansea, turning it into a vacation spot for the bored elite of Cymru. They are featured in a novel.

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