From Ardrana

Thurl is a Human thief from the city of Semmarch. He is the current guildmaster of the Thieves' Guild of Semmarch, having replaced Ilmarian three years ago after he was imprisoned by Captain Strickham, the city's mayor since the region broke off from the White Alliance.

Under Thurl, the guild at first had to keep their activity quite secret, but enforcement has grown lax over the past year. Thurl has ensured that the guild's ties to Morgan Bestler, proprietor of the Outlanders' Inn, have been maintained, allowing them to move people into and out of the city in secret, out of sight of the giff patrols.