193 CE Five men claimed the title of Roman emperor - Pertinax, Didius Julianus, Pescennius Niger, Clodius Albinus, and Septimius Severus - in a year of civil war after the murder of Emperor Commodus.
What famous and still surviving structure was built in Rome by the Emperors Vespasian and later Titus between about 70 and 80 CE?
Members of which family were, at various times, Kings or Emperors of Germany, Austria, Rome, Hungary, Spain and Bohemia between 1273 and 1918?
