The term "Ancients" refers to the massive progenitor civilization known to have existed before the Age of Darkness. The civlization is known more specifically as the Eladamri, though by what name they actually called themselves is unknown.
Ancients: the Builders of Roads, the people who founded the ancient Empire of Roads, which rose and fell in Antiquity before even the start of recorded history. The Fall of Roads was followed by a long dark age, out of which began the Mage Wars, or The Age of Magic. The Ancients are often identified as the Progenitors, or the Progenitor Race; however, evidence exists of another, older civilization, which likely gave birth to the Ancients before Antiquity.