(archaic) the present reigning emperor or empress regnant

(archaic) used in the beginning of narratives or story literature: once upon a time, long ago

right now, at this very moment

period drama

a historical period where social disorder is so great due to war, disease, political disorder etc. that there is little or no cultural development; Dark Ages

anachronism

youth (part of life following childhood)

zeitgeist (the spirit of the age)

Age of Enlightenment (period of history)

(archaeology) the Stone Age