An [Aes Sedai] and the [Amyrlin|Aes Sedai] 979 to 984 NE, raised from the [Gray Ajah].

! Physical Description

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

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! Chronology (Possible Spoilers)

* The day after [Tamra|Tamra Ospenya]'s death, the [Sitters] select Sierin Vayu as the new [Amyrlin|Aes Sedai]. This is two weeks after [Moiraine|Moiraine Damodred] and [Siuan|Siuan Sanche] 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 rules from 979 to 984 NE. ([Guide])
* Sierin dies mysteriously two years after [Alviarin|Alviarin Freidhen] is raised to head the [Black Ajah]. The [Black Ajah] did not have anything to do with her death. In fact, [Chesmal|Chesmal Emry] induces the [Red Ajah] to murder her. ([ACoS,Prologue], [WH,Ch10])
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! Other References (Possible Spoilers)

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# In [New Spring]
## [NS,Ch14] - When Sierin was raised to the shawl, many sisters were surprised that she chose the [Gray Ajah] instead of the [Red|Red Ajah].
## [NS,Ch14] - As [Amyrlin|Aes Sedai] she was a severe disciplinarian.
## [NS,Ch18] - When [Moiraine|Moiraine Damodred] sees [Siuan|Siuan Sanche] she thinks that Sierin Vayu discovered their plan and sent [Siuan|Siuan Sanche] to bring her back.
## [NS,Ch18] - Before she leaves the [White Tower], [Siuan|Siuan Sanche] leaves an anonymous note about the [Black Ajah] for Sierin.
# In [The Fires of Heaven]
## [TFoH,Ch15] - [Moiraine|Moiraine Damodred] recalls that Sierin was [Gray Ajah], but she acted more as if she were [Red Ajah].
# In [A Crown of Swords]
## [ACoS,Prologue] - [Alviarin|Alviarin Freidhen] wonders if [Elaida|Elaida do Avriny aRoihan] had anything to do with Sierin's death. The [Black Ajah] did not.
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