The Great Schism was a revolt of several Karangarian vassals who refused to accept the divinity of the Karangarian Emperor. An Abbess in the Imperial Capital assassinated the Emperor in 342, thus ending the royal line. The Abbess became the first Matriarch of the Reformed Temple.
After the Schism, a war erupted between the loyal imperial subjects, who soon called themselves Orthodox, and the rebels. In 377 a truce was negotiated with the aid of the elves of Curokas, but several small wars have been fought over religion since.
Slavery and the Reform
The first Matriarch announced the abolishion of slavery in the first year of the rebellion, gaining the support of the many slaves and serfs in the Capital. This helped consolidate the rebellion, but after some near defeats in the Schism War, the Matriarch changed her stance and allowed some slaveholding vassals (though the freed slaves stayed free).
After the truce, the King of Eizenthal announced the abolishion of slavery in all Royal demesnes, and the intention of banishing slavery in the rest of Eizenthal as well. Some argue that this was purely a move meant to stop the many uprisings in favor of the Reformists that had taken place, and that the former slaves have little better lives as serfs. Still, the effect of this move is that many former Reformist areas in Vlijden (among other places) have started supporting Eizenthal instead of Karangar. However, the move have also alienated some slaveholders, and plunged Vlijden into a civil war that still rages on.