Kingdom of Liones

Liones is a kingdom, located within Britannia (ブリタニア Buritania), that was formerly ruled by the family of Liones before a coup d'etat at the hands of the Holy Knights, which made it a puppet state. The kingdom had an alliance with the Fairy Clan before the burning of the Fairy King's Forest 20 years ago.

Background
The Kingdom is a large and powerful country which is protected by its knights and the Holy Knights. The Seven Deadly Sins were once an active group of knights in the kingdom before being framed for the murder of the Great Holy Knight Zaratras. It was reveal by Ban that the kingdom held a great treasure called Horn of Cernunnos which could summon a Goddess.

Plot
King Liones, although realizing that a predicted Holy War would soon occur, ordered all the Holy Knights to lay down their swords in an effort to avoid war. However, the Holy Knights, believing that the war was inevitable and that protection of the kingdom was their duty, captured the king, with the current Great Holy Knights, Hendricksen and Dreyfus, assuming command. They also started enslaving and forcing the citizens to participate in military efforts while justifying their enslaving with the fact that the citizens were being forced to do something for their own protection.

The three Seven Deadly Sins - Meliodas, Ban, and Gowther - attempted to invade the Kingdom of Liones in order to rescue Elizabeth who was kidnap. During their attack, an army from Camelot approaches Liones with their new king, Arthur. Hendricksen's Magic Research Facility building was completely destroyed during a battle between Diane and Dreyfus' Holy Knights.

Battles between the Seven Deadly Sins and the Holy Knights have caused significant destruction to all parts of the kingdom, forcing the regular knights to evacuate the citizens away from the battle as they could. The Deadly Sins and Holy Knight later join forces to stop Hendricksen and free Bartra and Elizabeth. After freeing them, Dreyfus was stripped of his rank due to his crime and Bartra was taken to Camelot for treatment as he was ill. But Hendricksen, after recovering from defeat, appeared by destroying a large section of the castle and awakened the New Generation's demon blood, turning them into Demons themselves, and began a rampage within the capital of Liones and its people, catching the Holy Knights and knights off guard. Various skirmishes broke out in the entire capital as the Holy Knights and knights immediately fought the Demons who were once their comrades but suffered heavy losses in the ensuing chaos to which Gustav called it like hell.

Throughout the chaotic battles between man and Demons, the entire civilian population were evacuated by some of the Holy Knights while their other comrades fight the Demons off from harming the people.

Trivia

 * Liones is named after Lyonesse, a country in the Arthurian legends which is the home of Tristan.
 * Before its destruction, Danafor was the only country who could rival Liones in terms of power.
 * Liones has a national holiday called the Kingdom Founding Day, which was also the day which the Seven Deadly Sins were framed as traitors.
 * Liones has been ruled by eleven kings, include Bartra.