Does being a republic cripple your whole dynasty's fertility or something?
I started as one of the Muslim berber tribals. Conquered and pillaged my way across Africa and stole the kingdom of Africa one chunk at a time. Then my initial character died, so I went to one of my heirs, who had for some reason converted to Christianity. At this point I had 5 brothers, all with duchies and strong families. I founded a Republic of Africa with the capital in Tunis, where I had left the holdings intact.
So now I'm a Christian Republic surrounded by and ruling Feudal Muslim family members. I gave out some gifts and managed to convince my entire family to switch to Christianity, built a ton of trade posts, and all was well. I'm rocking the Christian Berber Republic thing with vast amounts of gold, stomping on the Arabian empire and raiding and ransacking the entire Mediterranean region (including Rome, haha - this ruler is a terrible Catholic).
About thirty years later I start inheriting titles from my family, who were dieing of stupid reasons like going to war with one another over a county claim and dieing in battle. Looking in the family trees, not a SINGLE baby was born after the republic was founded. All the grandkids of the initial ruler were now married, but not one of them had children. And they were keeling over left and right, leaving the titles to me. My character had only had a few daughters and a son who died of some disease, but I just figured between the 30 or so nephews there would be plenty of inheritors.
So I divorce my wife and remarry a lustful bride in the hopes of producing some heirs before this thing goes completely south, and build out the fertility boosting upgrades. I die a few years later, still childless, and inherit into a 50 year old childless guy with a 48 year old wife. Divorce is denied, so I plot and kill her. Marry another 20 year old bride, and die a few years later. Game over.
Anyone else have an otherwise amazing game just end because their entire dynasty forgot how to reproduce?