Ladies Three

What we know

Pre-Strahd valley goddesses worshipped by first folk of Barovia (Session 21 @ 00:52:14)
Trio: The Seeker, The Weaver, The Huntress (Session 21 @ 00:52:14)
Worship fell after Zarovich conquest; much lore lost (Session 21 @ 00:52:14)
Descendants remain among forest folk (Svalich Woods) and mountain folk (Balinok Mountains) (Session 21 @ 00:52:14)
Monuments scattered about the valley—including megaliths with raven/three-pointed-star carvings (Session 21 @ 00:32:42)
Ezra is not one of the Ladies Three (Session 21 @ 00:53:51)

Lore shared by Lady Fiona Wachter en route from Old Bonegrinder Windmill during Session 21 (Session 21 @ 00:52:14).

Unconfirmed: whether Ladies Three interact with Strahd von Zarovich historically (Session 21 @ 00:53:51)