I found a mod that lets you form a Muslim Roman Empire, and I uh went a little crazy.
Starting as the Sultanate of Rum, Sultan Suleyman the Philosopher conquered Constantinople, founded a bloodline, and founded the Rumi Empire.
Bayezid the Conqueror, grandson of Suleyman, spent most of his long reign at war conquering large swaths of the Balkans, Anatolia, the Caucasus, Sicily, Syria, and North Africa. He defeated the Mongol hordes and slew Genghis Khan and threw the Aztec invaders out of the Maghreb. He also proved that the Seljuk dynasty was descended from Alexander the Great.
Ertekin the Wealthy ruled for only five years but completed the construction of the first phase of the Palace of Thrakia.
Afsin the Bear continued his grandfather Bayezid's legacy of conquest by relentless expanding to conquer Egypt, Iraq, and the Islamic heartland in Arabia. He also completed established his brother as the Sultan of Andalusia following a Jihad.
Caliph Ertekin completed the conquest of North Africa by subjugating the Almoravids, he deposed the Abbasids and claimed the Caliphate for his dynasty, he completed the conquests of Persia, Transoxania, Italy, while invading West and East Africa. In his last years, he reformed the Roman Empire and burned the Christian holy sites in Rome.
Caliph Yakut spent most of his reign invading the lands of India, demolishing the Hindu and Buddhist kingdoms and granting them to cadet branches. In the last years of his life, he swore to destroy the Holy Roman Empire.
Calipha Sevindik began her reign by invading and destorying the entire Holy Roman Empire, she conquered France, completed the destruction of Tamilakam, and pushed the bounds of the Seljuk Roman Empire to Finland and the Arctic Ocean. Most believe the Calipha will reign for many years to come, and surely the unstoppable tide of Islam will spread across the few holdouts in the world.
A link to the mod for those interested.
steamcommunity.com