Memory is a great artist. For every man and for every woman it makes the recollection of his or her life a work of art and an unfaithful record.
Which legend?
Arigon claimed Calisto =
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. The devs never confirmed this afaik, it's a Arigon hypotheses.
I believe the devs have confirmed Calisto's the most powerful vampire in game after the two myths. Based on this & her Hiereia title it's not unreasonable to assume she hails from Ancient Greece (up to 3000 years old).
Arigon himself said Virgil isn't Callisto's childe.
The devs never confirmed Virgil = Plubius afaik, it's a Arigon hypotheses. I don't know who Plubius is in any case.
So none of that Arcas stuff applies (attempted to kill Callisto etc., motive for seeking out MC).
Well given the game is inspired by VtM everything is related to that lore to some extent. There's no evidence Callisto or Virgil have any close connection to the myths though. At this point both are only just coming around to the idea there's an elder entombed in the area, let alone that it's a myth.
You need to be careful parsing what Arigon has said, most of it is his own conjecture, not information confirmed by the devs.