On an incidental note, a single Dark Sword rests within the walls of Fabul Temple. It is this very sword that led Fabul to its current state of prosperity. During the wars of a few hundred years ago, a lone Dark Knight, covered in wounds and at death's door, found his way to Fabul Temple. In the course of receiving treatment for his wounds, this knight experienced a spiritual awakening under the instruction and teachings of the High Abbot and ended up entering into the Fabul Temple faith. The sword enshrined within Fabul Temple is the Dark Sword that Dark Knight abandoned. The story of the Dark Knight soon spread throughout the world, and stalwart souls in search of spiritual training began one after another to flock to Fabul.
~ 100 Years ago - The Dark Knight Leonhart asks Fabul for lodging. There, through Abbot Fabul's teachings, he renounces his Dark Sword and enters the priesthood. Taking this as a sign, priests head for the temple in droves.
A story explaining the Deathbringer’s presence in Fabul from the Final Fantasy IV Settings Data Guidebook. As can be seen in the second portion (coming from Fabul’s timeline) an allusion is made to Final Fantasy II’s Leonhart, although the Japanese spelling used is slightly different.
The guidebook makes numerous references to FF2, most notably Mysidia being having a man named Minwu as a key figure in its history.
Translation source will be in the reblog because Tumblr search hates links.