The Sirdan is the high lord of a guild in Tai-tastigon. The reign and domain of a sirdan is known as a sirdanate. The term mostly appears in God Stalk, referring to Theocandi, Sirdan of the Thieves' Guild, but other guilds also have Sirdans. In the Thieves' Guild, the Sirdan is elected or reelected every 7 years, and other guilds likely follow similar practices.