WELL I tried too and gave up at 1447... but I'm not what we can call a good player

. I gave up because I needed 2 more wars to have complete control on Galilea : impossible to be done before 1453.
I think I started at ~1100, last year when the Jews have 2 counties !
I wasn't paying too much attention to the time stamp until I got to 1407 and I realised "Oh shit, Jerusalem-". It was already too late : the country was splitted between 5 kings because of a Jerusalem Revolt after a HRE successful Crusade : everyone got a piece of cake. I needed 8 wars splitted between 5 kings to have a complete control and create Israël.
Screenshot and History (pardon my french...) :
God bless it was SO difficult, I understand why it took 400 years for kmh42 hahahahaha. Getting the power in Abyssinia was really tricky at start because I'm still a begginner I guess ! But... when tamed the Abyssianians, I realised that the Seljuq had EVERYTHING from the Kingdom of Khiva to the North-East, Georgia and Anatolia in the North West, Bachulistan in the West, to Socotra in the South.
Seljuq + Fatimids at my doors, I was :///////////////////. And I didn't know the utility of the "Sow Dissent" at that time, so welp. I focused on upgrading my buildings with my 9 counties and I was able to reach 18K in 1150~. In the mean time, I was able to resist the blows of the Fatimids by playing with the Supply Limit ! (it is where I discovered that small Kingsdoms are able to win with that, playing is learning I guess~) (and THANK GOD my counties were half of the time stroke with diseases lol). Although.............. I couldn't form the Empire of Abyssinia because of the dejure-drift of the complete Nubia hahahahesdlkjdsq (well, I can have it with the Kingdom of Egypt, but it would mean : completely eradicate the Fatimids, difficult task indeed (or buying a favour during difficult financial times, marrying one of their daughter blabla having a claim blabla but : he hated me too much, and I seldom had good chancellors).
OF COURSE, luck happened and 2 smalls Seljuq revolts rose in the Duchy of Sanaa and Oman that I was able to annex fairly easily. The HUGE split between 5 nations happened just after I successfully took the Duchy of Medina (yes... bad idea) because of the Seljuq being *entertained* by a huge war with an Indian Kingdom.
But... the Era of Djihads happened, I got something like 1 dijhads every 10 years ?! It was really stressful (by both the Fatimid and the Sunnite Kingdoms). Sadly, I was successful in winning the Dihads, but I got only few duchies from the Fatimids by retaliation (I was too afraid to do Holy Wars against the Kingdoms until the mid-14th Century, huge mistake :/).
Also, I was stroke by a HUGE instability in my Kingdom. I was too much focused on the foreign affairs that I forgot to manage mine, especially the division of powers. The Duke of Medine was at a point tied with me on army forces... The Spymaster wasn't successful. For the 50 next years, I was busy putting down rebellions (having to hire merc 6/7 times...) because I didn't have the flexibility to accept minimal delegation of power for the council (at least for a time, it's so easy to revert it... I was so inexperienced :'( ).
I thought that imprisoning them, taking back their duchy title and putting another Duke was THE play to weaken my vassals, but usually, with their 3/5 counties, they just take back the power after 2/3 years :'))))))))). So yeah difficult, thanksfully, they do not rebel during Holy Wars so I had some peace of mind after 1400 and my continuous wars !
and yes, Brittony is in Andalousia and the Mongol Empire invaded the Byzantine Empire (after, of course, ADOPTING SUNNISM, why are you so eager to save the Seljuq in all of my games, Mongols...)
My numerous rulers before I gave up : (my council didn't want to attack one of the Kingdoms who held Galilea, also...)
The Rebellious Times were during the reigns of Dawit, Makeda and the childhood of Geteye (all "Saints" because of failed Dihads, as I explained). Crazy how I learned to hate the unchanged -10 and -20 Opinions Modifiers from "Female Ruler" and "Pretender" with the Conclave patch...
Religious Maps (In french, but you can figure easily :0) :
SO DIFFICULT to convert counties ! It's normal I know, but fuck, even with 50+ Moral Authority, the Religious Heresies Outbreaks were SO NUMEROUS !
I remember that the first county I converted to Judaism became a Samaritan Heresy 3 years later... And the Monophysite/Miaphysite, it is so comical. When the Miaphysite counties were outnumbering the Monophysite ones because of Low Moral authority, the heresy relationship would revert. But then, the Monophysites would outnumber the Miaphysites because, again, of heresies outbreaks. The Fatimids put down like 7th Monophysites rebellions, I had like 4. But I also had the Shia ones + the Sunnites Ones and the Yazidia ones, sometimes 2 would pop at the exact same time... So tiring, but it was good for my moral authority haha.
I hated a bit Paradox for that, a small religion is difficult to spread out because of Heresies :/.
Also yes, the Mongols went from Orthodoxy, to Sunnism, to Catholicism as you can see

.
Cultural Maps :
You can see the traces of the former Turkic Hegemony very well here (all the way to the top...). But now, you're asking yourself : why was I so bad at converting provinces ? Well, for some reasons, I thought that it was possible to convert a county, by pure chance, to Ashkenazi Culture... It didn't work. It was so bad, that most of my vassals hated me for being an Ethiopian (-15 is HARSH now

), this is why I had, at the end of my game, HUGE dynasties of Ashkenazi jews hahahaha *sweat*
I think that's it for my failed run !! Too bad I failed like this, as I want the achievement, I'll surely do it in the future as a Khazar~