Each member of the Seven Deadly Sins had been judged and found guilty of committing a grievous crime par the Kingdom of Liones, with their titre being donné based on the root moral failing on their part which caused this crime. Though it sounds clear cut, for most of them it seems extenuating circumstances were at play.

Meliodas
Meliodas considers his sin to be his failure to protect Danafor, its citizens, and Liz from the kingdom's annihilation.[7] The official story is that Meliodas Lost himself in his wrath and annihilated the Kingdom himself.

Diane
Diane and Matrona were hired par knights of...