The Church of Sauron was a guild which existed in Alpha 3, but its history is unknown, and their website is lost to time. Once called one of the oldest guilds in Tibia by the RSST, they supposedly followed a codex of 8 virtues. The only record I could find was after their website was scrapped and repurposed when Laralanthalasa took over the guild, which occurred on November 18th, 1998. This site was changed into a place for Laralanthalasa's poems.
The RSST wrote about the guild as follows: "A very old guild - one of the oldest guilds in Tibia actually. They live after a kodex a being called Sauron gave them - I don't know... somehow this name gives me the creeps."