That raises another question I had. Netheril was an empire, and empires have emperors (or a ruling council, at least). I’d always fancied that to be Ioulaum – a single unconquered ruler, ruling for millennia from his original enclave (until he abandoned it). Is that correct? Like real-world Rome, Netheril has a long, complex history.
Ioulaum was a war-leader/innovator among the Netherese during the 500-year Mythallar Era, and was succeeded by the High Mages of Netheril ruling council in the Silver Age; see p97 of LOST EMPIRES OF FAERUN.#Realmslore

— Ed Greenwood (@TheEdVerse) March 10, 2020