Gyrfalcon

Gyrfalcon is the secretive leader of The Akorros Thieves Guild. Very few people know their true identity, but everyone in Akorros has heard of them and whispers about them in hushed tones. No-one wants to hear the words "the Gyrfalcon wants to speak to you", or worse, "the Gyrfalcon is disappointed".
The Toney Family have put a price of ten thousand daros on the Gyrfalcon's head, but given that the Thieves Guild owns the Corruption Corps, and given the power the Thieves Guild and their "enforcers" have in Akorros, this has had little effect. A few enterprising adventurers started making enquiries, but they all mysteriously disappeared and have never been seen again.
Even in the Thieves' Guild, few members know their identity. Instructions are passed down through a chain of lieutenants, dead drops and cutouts, and following the chain back is strongly (and forcibly) discouraged. A chain of fences and front organisations provide a route to return the fruits of the requested activity.
The name first began to be heard 18 years ago in relation to a faction in Northhill. This faction seemed to be growing in power, and began to take over other factions in the area by a process of assimilation, enticement (conditions were better in the new faction) and outright takeover. By the time the authorities woke up to the threat, the faction had control of most of the old quarter of Akorros, along with large tracts of the new town and parts of the Spice Quarter, and there was little they could do.
The Tongs of the Spice Quarter proved to have too much power and loyalty within their territory, so rather than try to take them over or drive them out, the Gyrfalcon turned diplomat and brokered The Treaty of Protection with them, setting out territorial boundaries and defining ways of working together for mutual good.