Roman Empire

Short definition from Wiktionary

Proper noun

1. 1
   An ancient empire based out of Rome, which succeeded the Roman Republic and existed between 27 B.C.E. and 476 C.E. in the west (and until 1453 C.E. in the east; see Byzantine Empire), encompassing vast territories in Europe, Asia and Africa, stretching from Britain and Germany to Spain, North Africa and the Persian Gulf.
2. 2
   The Holy Roman Empire.

Noun

1. 1
   An unexpected or apparently random topic that one frequently thinks about.