Sierin Vayu

The Amyrlin Seat 979-984, raised from the Gray Ajah.

Physical Description

She is very plump with a round face, but she has hard eyes. (NS,Ch14)

The day after Tamra Ospenya's death, the Sitters select Sierin Vayu as the new Amyrlin Seat. This is two weeks after Moiraine and Siuan are raised to Aes Sedai. (NS,Ch14, TFoH,Ch15)
Sierin begins her rule with an iron hand firing all male clerks and ordering two sisters birched and three others exiled for a year. (NS,Ch14)
Sierin dies mysteriously two years after Tamra Ospenya. There is a disconnect on timing here as the Guide says she ruled for five years. The Black Ajah did not have anything to do with her death. In fact, Chesmal Emry induces the Red Ajah to murder her. (ACoS,Prologue, WH,Ch10)

NS,Ch14 – When Sierin was raised to the shawl, many sisters were surprised that she chose the Gray Ajah instead of the Red.
NS,Ch14 - As Amyrlin she was a severe disciplinarian.
NS,Ch18 – When Moiraine sees Siuan she thinks that Sierin Vayu discovered their plan and sent Siuan to bring her back.
NS,Ch18 - Before she leaves the White Tower, Siuan leaves an anonymous note about the Black Ajah for Sierin.
TFoH,Ch15 - Moiraine recalls that Sierin was Gray Ajah, but she acted more as if she were Red Ajah.
ACoS,Prologue - Alviarin wonders if Elaida had anything to do with Sierin's death. The Black Ajah did not.