Yes Milid of Spain the father of the Celts has very interesting offspring.I asume the Celts you are referring to are Pre-Milid.
The word Osiris is quite fitting as they also had a Egiptian Past.
For example "New Grange" ritual site.I am still battling to make the connection between the Merovingian Wizard Kings /Fisher Kings or Nazrites to use the origional term and the Pendragons ,how are they related?
Dirk van Rensburg
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