Empire of Roads
The Empire of Roads is the name often given to the Eladamri civilization, which rose and fell before the dawn of recorded history (B.G.A. 3700ish). The name was first coined during the Mage Wars, mostly by philosophers describing the vast fallen civilization.
Since the name 'Eladamri' was not discovered until late in the Sixth Age, 'Empire of Roads' is the most common name for the massive, lost civilization.