Is there any possibility of modding overrides for regnal numbers? Henry IV is numbered Henry III in‑game, because the first Emperor Henry was Henry II of Germany. It’s one of those high‑visibility minor errors.
I’m pretty sure it didn’t use to be this way (in vanilla or SWMH) before 2.2. But I’m not sure why it was correct then. I think the Imperial Crown was just handwaved onto the Kings of Germany before Otto I. Which is far worse than an off‑by‑one in the numbering. But then, coronations don’t really exist in CK2. That’s probably the number one thing I’d like to see added, whether in vanilla or HIP, especially for the HRE. Maybe it would only be flavor text (except for the HRE), but whatever, that’s fine. /rant
I’m pretty sure it didn’t use to be this way (in vanilla or SWMH) before 2.2. But I’m not sure why it was correct then. I think the Imperial Crown was just handwaved onto the Kings of Germany before Otto I. Which is far worse than an off‑by‑one in the numbering. But then, coronations don’t really exist in CK2. That’s probably the number one thing I’d like to see added, whether in vanilla or HIP, especially for the HRE. Maybe it would only be flavor text (except for the HRE), but whatever, that’s fine. /rant