Mercer Frey is the guildmaster of the Thieves Guild, which he double crosses.
Appearances[]
Aela's New Outfits[]
Brynjolf introduces S'oggy to who he's working for, Mercer Frey.
S'oggy Sketch Artist[]
S'oggy reports back to Mercer about the Honningbrew Meadery incident. Mercer theorizes that their adversary is trying to put a wedge between Maven and the Thieves Guild, which he thinks is "very clever."