Holy Knights

The Holy Knights (聖騎士 Seikishi) are the most powerful knights in Britannia who are heroes that protect the kingdom. They are terrifying individuals, with each able to match an entire country's army in strength, and having magic that transcends human knowledge imbued within their bodies.

10 years ago
After the Seven Deadly Sins were framed for killing the Great Holy Knight, Zaratras, and plotting to overthrow the Kingdom, the entire order of Britannia's Holy Knights were dispatched to kill them. After the group of knights' supposed offense and subsequent escape of at least four of them, the Seven Deadly Sins were dissolved and were relentlessly hunted by the Holy Knights.

Present day
A few days before Elizabeth found Meliodas, the Holy Knights had orchestrated a coup d'etat and captured King Lyonesse, the king of Britannia. The kingdom, now under the control of the Holy Knights, fell into a state of distress as citizens from towns and villages surrounding the kingdom were enslaved or forcefully recruited into joining a furtive war effort; the men being forcibly trained as soldiers, the women and children being forced to amass food for storage, and the elderly being forced to construct castle walls. Death has now become the penalty for insubordination under the rule of the Holy Knights.

Great Holy Knight
The Great Holy Knights are the most powerful of of the Holy Knights, and possess the authorities of commanding over them, thus making them the leaders of the Holy Knights. This gave the current Great Holy Knights, Dreyfus and Hendricksen, command over the whole country after the coup d'état.

Holy Knight
The Holy Knight is a title given to well established knights that have great strength, which is equal to that of an army. They have command over ordinary knights and train apprentices to become full fledged Holy Knights. All of them are imbued with extraordinary powers, such as Gilthunder's lightning abilities and Geera's explosion abilities.

Apprentice Holy Knight
Apprentice Holy Knights, as their name suggests, are apprentices and disciples of existing Holy Knights who are undergoing training to become seasoned and qualified Holy Knights. They are fairly powerful compared to ordinary knights, whom they have authorities to command over, but are still much weaker than a Holy Knight.

New Generations
The Great Holy Knight Hendricksen has secretly been using the blood of a demon, which has power-enhancing qualities, to give new abilities to apprentice Holy Knights and other knights previously considered to be failures. Such kingdom, not knowing the cause of many knights suddenly gaining great powers, has dubbed them the "New Generation".

Trivia

 * Holy Knight is a special job class in Final Fantasy Tactics for the PlayStation.