In 395 AD, the Roman Empire split up for good due to the death of Theodosius I. It divided into the Western Roman Empire and the Eastern Roman Empire (a.k.a. Byzantine Empire.)
What if there was another Roman Empire based in North Africa? What would it be called? What would its capital be? How...
The challenge is to establish a Maghrebi Romance language (ideally with Mozarabic, African Romance or even Sardinian and Maltese influences though not essential) in North Africa and have it gradually supplant Maghrebi Arabic.