"Empress Celene is called out of Val Royeaux after news of an elven rebellion in Halamshiral. The move is thought to have been orchestrated by Gaspard. Celene’s absence fuels rumors of her death or capture. While she is gone, a violent uprising at the White Spire - a Circle Tower in Val Royeaux - leaves many senior mages dead. The uprising is apparently supported by the Divine through her agents, including the bard Leliana. In response, Lord Seeker Lambert declares the Circle of Magi no more, leaving the future of mages in Thedas uncertain.
"Following the conflict at the White Spire, Lambert cancels the Nevarran Accord, severing ties between the Seekers and the Chantry. Allegiances between Seekers and Templars are split. Some still support the Divine. Lambert goes missing soon after and is presumed dead."
Altho... I thought the Circle was disbanded when the Accord was cancelled. Hmm... WoT puts Circle disbanded after Accord.