Board Thread:Questions and Answers/@comment-13439417-20151115150226/@comment-26363301-20151116055640

I think that him being deemed a traitor is actually a reference to him abandoning the demon clan, not teh 10 commandments. I would also assume that Meliodas knew about these 10 before he left and perhaps learnt more as the war progressed. I'm not sure if he was a member of the 10 commandments, i'd imagine if he was then perhaps he was replaced by Zeldris or perhaps Galan?

I honestly don't think we have enough evidence the theorize what happened between Meliodas and the holy war 3000 years ago, but, i can  tell you that we might get the answers in this arc whilst they are fighting teh comamndments or potentially when the 7 sins finally get back together.