She is headmistress of the [School of Cairhien]. 

! Physical Description

She is a stocky woman with more gray than black in her hair. She has a blunt face and a sweet and youthful voice. ([LoC,Ch18]) 

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! Chronology (Possible Spoilers)

* Idrien designs and builds a giant crossbow that is used in the defense of [Cairhien|Cairhien (City)]. ([TFoH,Ch41], [LoC,Ch18])
* Idrien Tarsin and [Kin Tovere] are two of the first members of the [School of Cairhien]. ([TFoH,Ch49])
* Idrien gives [Rand|Rand alThor] a tour of the school. ([LoC,Ch18])
* [Herid Fel] wanders off from the school and [Rand|Rand alThor] yells at Idrien because he is not there. ([LoC,Ch28])
* [Rand|Rand alThor] and [Min|Min Farshaw] visit Idrien and [Herid Fel] at [Rand|Rand alThor]'s school. ([LoC,Ch50])
* Idrien discovers [Herid Fel] in his study torn limb from limb. ([LoC,Epilogue]) 
* The next day she tells [Rand|Rand alThor] that [Herid Fel] is dead. ([ACoS,Ch18])
* [Rand|Rand alThor] and [Min|Min Farshaw] meet with Idrien and [Dobraine|Dobraine Taborwin] in [Rand|Rand alThor]'s school so [Min|Min Farshaw] can get some of [Herid Fel]'s books. Idrien tells [Rand|Rand alThor] about some of the school's recent inventions. ([WH,Prologue])
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! Other References (Possible Spoilers)

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More [Category Characters|Category.Characters]