Woah... So was running a multiplayer game with one of me m8s, pretty standard. He started off as the Caliph of the Abbasid Empire, but decided to jump down to Egyptian Sultanate after it proved too stressful for him (he was fairly new to the game). I started as a Count of Esfahan, only I was Han, Confucian and Zhuge Liang. I carved out my own small (but elite) Duchy in Persia before being assassinated at age 33 by one of my courtiers, passing down the throne from my genius strategist to his imbecile of a son. Funnily enough, my imbecile of a son proved through stubbornness and bravery, to be an incredibly talented ruler, managing to eliminate traitors, peacefully convert all the Zoroastrian and Sunni courtiers to Confucianism, thereby securing the internal realm. Meanwhile my good friend in Cairo expanded the Egyptian Sultanate, holy warring all over the place, giving every single land he conquered to just three Dukes.
My imbecile-son-and-immensely-talented-ruler eventually persisted to become the last heathen Prince of the Abbasid Empire, and survived having cancer for 18 years, dying at the age of 61. In the West, my friend's Sultan was assassinated, then the next Sultan assassinated, Cairo and the Sultanate being inherited by his brother, while his line of the dynasty was exiled to Mount Sinai.
Where this gets weird is that on my screen, I saw his brother get assassinated, putting him back in charge of Cairo and the Sultanate. On his screen, his brother had birthed an heir and he was still an exile on Mount Sinai. I saved the game and restarted, and in this save his brother had been assassinated and he returned to Cairo as Sultan. We joked about how he had this terrible dream where he was an exile on Sinai, but then lamented that we had not tried to make two saves to discover if our games had split, creating two timelines - of the darkest timeline, and the brightest timeline.
We subsequently spent the next generation fending off the Caliphs. I still remain a Han Confucian and have survived having my entire Duchy occupied for 9 years and survived the Caliph trying to seize all of my lands five times now. When the Caliph had 20,000 men, I thought I needed 10,000 to force him to white peace. When the Caliph had 25,000 men, I thought I needed 7,000 men to force him to white peace. When the Caliph had 30,000 men, I thought I needed 3,000 men to win. I like this run very much, I've escaped the brink of destruction so many times... In one particular instance I nearly rage quit when on the cusp of one final battle, a band of Turkic mercenaries took 350 gold and left without fighting a single battle, and against all odds I survived that. I may make an AAR of it, but I just regret not making those two saves. Timeline split!