Woman of the waters & ath liag finn

Cannonical

New Member
I've been busy reading a book by Lady Gregory, during the section based around the tales of Fionn mac Cumhaill and the Ath Liag Finn comes up along with a mention of a lady known as "The Woman of the Waves". I've searched but I couldn't find anything else related to this role or person, could any of you provide any information?
 
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