NPC Guildmaster
From UO Lost Lands Wiki
In Ultima Online, there are numerous NPC guilds which a player can join.
The most useful guild is no doubt the Thieves Guild, as being a member is a requirement to steal from innocent players.
Other NPC guilds in the game are, but not limited to: Mage's guild, Blacksmith's guild, Fisher's guild, Miner's guild, Warrior's guild. Although many of these guilds offer no benefit and are strictly for RP purposes, some do offer cheaper prices on wares sold by their respective vendors.