CharlesRyan
Adventurer
All I'm saying is that historically, according to eg the last sword display I saw (at the Archaeolink centre in Aberdeenshire, Scotland), big ole two-handed swords, like what D&D calls greatswords, were sometimes called "long swords", because they were longer than regular swords (arming swords) and broadswords. These same swords were also sometimes called great or grete swords.
This is my understanding as well. What D&D (and most modern games and fiction) calls a longsword was more commonly known as an arming sword; the term longsword, when used, more likely referred to what games call a greatsword or two-handed sword.
But Umbran's point about the lack of standard nomenclature, not just between time periods and societies but even within a given society, is equally valid.