Britannia

is the main setting of most of the events in The Seven Deadly Sins series.

3,000 years ago
Britannia was once beset in a Holy War between the Four Clans (Human, Giant, Fairy, and Goddess) and the Demon Clan, causing great destruction and death in the continent until the allied clans' victory with the Coffin of Eternal Darkness sealing away the Demon Realm from Britannia.

Many years passed as the fairies, giants and goddesses had faded away into legend and folklore after returning to their respective realms including the Demon Clan among the people in Britannia and the humans ruled the realm with the Holy Knights as their guardians.

Trivia

 * Britannia is the old name for Britain.