User blog comment:FTWinchester/Retcon of Avalon/@comment-10603955-20121201060107/@comment-10603955-20121206053428

Dragons, originally within antiquity, were mostly envisaged as very large serpents. It wasn't until the Middle Ages that dragons started to be depicted as giant overgrown lizards.

In other words, my point stand; Dragons are the ancient serpents because they were originally serpents.

More accuratly speaking: Their are two types of dragons... err... actually, make it three. One is the Eastern, 2nd is Western, the 3rd would be leviathans if you count it as a dragon (some people do). The Eastern actually describes it properly while Western is well...