3. When Disciple talks about Revan, he mentions that Revan was the padawan of Arren Kae. To me this suggests that Arren Kae was Revan's first master. He also mentions, as does Kreia herself, that Revan returned to his first and final master to learn how to leave the jedi order. If Kae was his first master, then Kreia must be Kae.
There are other clues, like Atton mentioning that Kreia must have been beautiful once, or that Kreia seems to hide her presence from Atris when the Exile first meets Atris on Telos, or even that Kreia admits knowing the Handmaiden's mother and yet never uses that knowledge to manipulate the Handmaiden with, but I find the above three to be the major clues.
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You guys take stuff too seriously.And I thought someone said Arren was in the Mandalorian War.I thought Kreia said she didn't go to war....must just be me I guess.