The open area outside the city walls went through a process of urbanization during the late Republican and early imperial age.

This question used to be raised in ancient literature . . . though much less since the imperial age began.

Now only half of the inner façade, covered with white stone in the imperial age, and the foundings are visible.

Over time the czars overwhelmed resistance, and in an imperial age, nobody cared.

This festival continued as an annual event through the imperial age of Rome.

Very few buildings remain from the Age of Discovery or the early Portuguese imperial age.

A new kind of "imperial age," in his phrase, is dawning.

Thus this was a relic of a more imperial age.

It had a Senate and a currency of its own, a sign of its importance in the imperial age.

Additional research during the 20th century showed that the town had remarkable importance during the imperial age.