Celt

The Celts were an Human ethnic group which inhabited England early in its history. When the Romans drove the Celts out of England, they were allowed to settle in Avalon. (EDA: The Shadows of Avalon)

Celt worship

 * Cessair was worshipped as the goddess Cailleach by the Celts, specifically the Druids. (DW: The Stones of Blood)
 * The Celts also thought of Saul as a local spirit. (NA: Timewyrm: Revelation)