You were 10 Commandaters Leader even before then Meliodas.You noticed Demon King is using you like a puppet he sended you to die on Earth.He chained all of your body in a cave with some dark magic if someone tries to free you..Meliodas always thought you are dead,he always respected you but he was also curious where you have gone.

3000 Years later..

Meliodas was in Boar Hat with Ban,Merlin they were passing a huge mountain when Merlin and Meliodas felt a unseasy feeling coming from mountain