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Biruta Anna Marquette Icarti is a sorceress who worked under Ortolan at Rissberg castle's supervisory board. She has blonde hair and is described as quite comely.
In Season of Storms, she wrote a letter to Narses de la Roche, leader of the Chapter, in which she tried to excuse Sorel Degerlund's deeds and tried to shift the attention of the Chapter away from Rissberg. However, she was forced to leave the position and returned to the academy in Aretuza.