This compares the Korrigans to three earlier mythological figures:
The Lady of the Fountain
The Lady of the Lake
Ceridwen is first (and perhaps only) mentioned in the story of Taliesin, in the Mabinogion. She is not depicted favorably - as a magical figure who, to put it one way, reacts poorly to failure. She really only appears in the first part ...
Yes, we have two main sources from the Early Roman Occupation era:
Strabo, Geographies (64-21 BCE):
The Romans put a stop both to these customs and to the ones connected
with sacrifice and divination, as they were in conflict with our own
ways: for example, they would strike a man who had been consecrated
for sacrifice in the back with a sword, and ...