alternatehistory.com

Here is a draft..

PERSIAN RECONQUISTA

Korean Unification
DeokMan, the later Queen SeonDeok marries the king of Koguryo after experiencing the heart ache of seeing her beloved marry her sister she decided to marry the King Yeongnyu of Koguryo hoping that it would unite the peninsula and make peace with Koguryo and because the Tang Dynasty is their common enemy and threat and the thrones of Koguryo and Silla were merged in 632 AD as Joseon.
In 661 AD, Joseon under the son of Queen Seondeok and Yeongnyu of Koguryo named Gaesomun invades and anihilates Baekje.
Start of Persian Reconquista
In 680 Persia a Christian intellectual encourages the Christians in Iran, specifically from Kurdistan to rebel from the Muslims and a Christian rebel state which is absorbed by Alania which started a Christian Reconquista of Iran and became a , Alania is called as ChristoAryana, the Christian fate of Alania merged with Manicheanism and recognized Mani as a saint ChristoAryana and the Byzantine Empire become more unified, ChristoAryana however has a different flavour of Christianity.
Top