The Shaolin Monks was a guild in Beta 5 which was established sometime before April 27th, 1999. This guild appeared to be more like a guild of friends, but they followed a roleplay codex which disallowed in game marriage, drinking, and killing deer and dogs. The name for the guild was inspired by the monks seen on TV at the time. They were a good aligned guild which focused on fighting evil though I don't know if the found themselves into any conflicts. To join you needed to be level 9 if you were a knight or paladin but could likely get in at lower levels if you were a mage as they were desirable.
The Codex of the Shaolin Monks was the below:
"§1. You should always help other Tibia players in need of it (especaily members).
§2. If u choose to join the clan u must live in celbat (your char),
The shaolin monks are a peaceful clan so if u join u most say no to all sort of evil.
§3. Fight all Evil, in forms of PK:s or Monsters but try only to kill peoples in selfdefence.
§4. And itīs prohibited to drink except on guild's party.
§5. Itīs prohibited to kill deers and dogs"