I know this goes beyond the scope of fantasy, but I'm specifically interested in Game of Thrones. I've been compiling a spreadsheet of every named character within Game of Thrones, and am not sure how to deal with nicknames and regnal numbers. For example, would I write the name of Aegon Targaryen, fourth of his name, known as "the Unworthy", as:
Aegon IV "the Unworthy" Targaryen
Aegon "the Unworthy" IV Targaryen
Or some other method entirely? Perhaps it seems strange to include nicknames, but given just how prolific ASOIAF's character list is - particularly House Targaryen - I figured it was a useful method of differentiation.