History of Shadowdale - Jyordhan the False Lord:

Lord Aumry was assassinated by Zhentarim agents, who in turn were captured and killed by the warrior Jyordhan. Jyordhan, with the Pendant of Ashaba in hand (the symbol of the lordship in the Dales), proceeded to present himself as the new lord, and was so acclaimed by the people. It was unknown to the people that Jyordhan was also an agent of the Zhentarim, and that the entire proceeding had actually been a ruse.

Jyordhan abandoned the Twisted Tower, instead establishing himself in Castle Krag east of Shadowdale. His court was soon overrun with agents of the Black Network. When the people eventually revolted, Zhentil Keep sent peace-keeping forces to maintain Jyordhan's rule. Sylune, Lord Aumry's widow, now aware of the deception but a firm pacifist, did her best to keep the Dale healthy and intact during Jyordhan's evil rule.