In olden Britian, Orland, who is in search for the key to becoming King, meets a beautiful priest by the name of Ethelred, who is on the verge of being killed as a sacrifice. Now begins the dangerous adventure of these two, who have met in a chaotic world surrounded by swords and spiritual beliefs...

From Aerandria Scans:

It's the 16th century and the knights of the Mediterranean country Malta take pride in being the strongest in the world. Aciel is a beautiful lady-knight who gradually makes her way into the group of the knights, despite the fact it's forbidden for women to be knights. Learn the tale of the magnificent knights whose charms neither friends nor foes can resist!