The headquarters of the Aes Sedai in Tar Valon, and by extension the Aes Sedai organisation itself. A collaboration between Aes Sedai designers and Ogier builders begun in 98 AB, the Tower took a century to complete. It houses the Hall of the Tower (the Aes Sedai governing body of Sitters), training facilities for novices and Accepted, and the vast archives of Aes Sedai knowledge. The Tower split during the series when Elaida deposed Siuan Sanche as Amyrlin, but was reunited under Egwene al'Vere.