Seven Deadly Sins

The Seven Deadly Sins (七つの大罪 Nanatsu no Taizai) was the strongest and cruelest order of knights in the kingdom formed by brutal criminals who carved symbols of seven beast onto their body. They are currently branded as traitors of Britannia.

Background
The group was originally an order of knights which served the kingdom of Britannia, but due to being framed for assassinating Zaratras, the Great Holy Knight, they became branded as villains and traitors. It is suspected that one of the members in the Seven Deadly Sins could be a traitor who helped plot the trickery. Currently, Ban and King are the most plausible suspects.

Sins Committed
Each of the Seven Deadly Sins have commited a crime so great, it can't be erased. Only Ban sins was revealed so far.

Meliodas
Meliodas sin is yet to be revealed.

Diane
Diane sin is yet to be revealed.

Ban
Ban met the Saint of the Fountain of Youth and killed her for immortality and was known for the Sin of Greed due to the greed for immortality.

King
King sin is yet to be revealed..

Merlin
Merlin sin is yet to be revealed.

Escanor
Escanor sin is yet to be revealed.

Gowther
Gowther sin is yet to be revealed.

Introduction Arc
Elizabeth Leoneth goes on a journey to find the Seven Deadly Sins, believing they are the only ones who can stop the Holy Knights. She goes to a Boar Hat bar, where luckily for her, the owner turned to be one of the Seven Deadly Sins, Meliodas the Dragon's Sin of Wrath, who saved her life few times, while he was chased by kingdom's knights. Meliodas revealed that he is also looking for the rest of the Sins, and he uses Boar Hat to gather information. They team up and start travelling together looking for the rest Sins. Their lead them to the village of Bernia. There Meliodas helped the people with removing a holy knights sword, which was sealing the underground water and would have lead to the destruction of the village. Upon learning that someone pull out his sword, Gilthunder from the Holy Knights decided to confirm if that was accident. He throw a spear towards the village in order to destroy it, but Meliodas was able to catch the spear and even returning it to Fort Solgales, where Gilthunder was. That was the evidence for Gilthunder, that the Seven Deadly Sins lives.

Forest of White Dreams Arc
Meliodas and Elizabeth journey leads them to the Forest of White Dreams, where supposedly a Sin can be hiding. Meliodas guess turned true, and there they where able to find member of the Seven Deadly Sins, Diane, The Serpent's Sins of Envy. Moments later after reunion, a Holy Knight named Gilthunder found them. He wanted to kill them not only for their treachery, but for personal reasons too: revenge for his father Zaratras and proving that he was able to surpass him. In the fight, Meliodas purposely lets himself get injured in order to get information about the other Sins. Although Gilthunder didn't know about the location for 3 of them, he revealed that Ban, the Fox's Sin of Greed is imprisoned in Baste Dungeon, while King, the Grizzly's Sin of Sloth have perished in the Kingdom of the Dead. After that Diane got rid of Gilthunder, sending him flying to the nearest town and the group, together with Diane decided to go after Ban next.

Baste Dungeon Arc
They went to Dalmary Town, located next to Baste Dungeon, where they bringed Meliodas to a doctor, to look after his injury. While staying in the town, Friesia, one of the members of Weird Fangs group from the Holy Knights, learned about Sins presents and when out of the Baste Dungeon in order to destroy them. His attack was stopped by Diane, who when after him next. While Meliodas was actually getting poisoned by the doctor, who where working for the Weird Fangs. That moment Golgius from Weird Fangs also showed up, wanting to take Meliodas sword and Elizabeth, but was surprised that Meliodas actually waked up. At the same time, upon hearing about Meliodas, Ban broke out from his cell and was encountered by a young Holy Knight apprentice, Jericho. Unfortunately for the young apprentice, she was not a match for Ban, who easily defeated her.