—Elayne Trakand's thoughts of Sereille Bagand
Sareille Bagand was born in Far Madding in 586 NE, went to the Tower in 601 and after thirteen years as Novice and eleven as Accepted she was raised to the shawl in the year 625 at age 39 choosing the White Ajah.
She was elected Sitter in the year 738 NE and she maintained this position for twenty-one years. In the year 759 NE she was nominated Mistress of Novices under Myriam Copan and served in this work for 107 years under also the two following Amyrlin Zeranda Tyrim and Parenia Demalle, becoming legendary. Finally she was elected Amyrlin Seat in the year 866 ruling till her dead in 890.
It seems that she was not very strong in the One Power (only level 21-9 according to The Wheel of Time Companion) but despite it she was one of the most influential Aes Sedai in the last millennium.
She gained a reputation for being tough and a severe disciplinarian, placing strict importance on rules and proprieties. It is possible that Sereille's reputation of austere sternness and disciplinary severity was known of outside her own Ajah.
She used that toughness and discipline and became one of the greatest Amyrlins in history, raising the influence and prestige of the White Tower to levels seldom equaled since before Artur Hawkwing. It was said that Sereille controlled the Tower by the sheer force of her will.
She couldn't stand Cadsuane Melaidhrin because like herself, Cadsuane had an air of control and confidence. They both expected subservience from each other and therefore they would constantly butt heads with each other. Despite this, Cadsuane thwarted a planned coup to overthrow Sereille. The conspirators, thinking that they would gain support from Cadsuane, who was Sereille's biggest adversary, went to Cadsuane to gain her support. This was a mistake. Cadsuane dragged them to the Amyrlin's office herself. Sereille wasn't particularly pleased to obtain help from someone she despised.
She was Parenia Demalle's successor and Aleis Romlin's predecessor. After her passing, there was a large support in the Hall to make Cadsuane Amyrlin rather than Aleis. Cadsuane, wanting to avoid this, avoided the Tower for an entire ten years.