Is it worth it converting to EU IV? I've never tried that.
The Aztecs own the British Isles, the Holy Roman Empire owns western europe, Avaria owns much of Scandinavia and Eastern Europe, and The Reformed Tengri Ottomans are strong in the farther east. Abyssinia and Nubia firmly control Eastern Africa. The Byzantines hold Greece and Arabia is largely fractured. I'm a Reformed Sahelian Mande Merchant Republic controlling the western half of Africa. It's obviously going to be a very different start from the normal EU IV.