The list of Kings named Charles in France, up to the point I'm asking about goes:
Originally French Kings didn't have regnal numbers, so Charles the Wise changed that, by declaring he would hereafter be known as Charles V. However, he was the sixth King Charles of France, so why did he choose five as his number? Did he have a reasoning for it, or did he just miscount?
It seems Charles the Fat was not considered as a French king, as he was King of East Francia ("Germany") and Emperor while West Francia ("France") was ruled by Carloma II until 884, when Charles the Simple was still a kid. Nobles call to Charles the Fat to take the regency, which led to him not being counted as a king of France, and Charles the Simple is counted as Charles III, as he became king in 898