The ancient historian Dionysius of Halicarnassus is believed to have invented the Alban chronology to fill the gap of centuries between the fall of Troy and the founding of Rome. This could have been achieved by him taking the Roman history as it was, comparing it with the Greek, and inserting Greek Olympiads or Athenian archons. This method would have made the Greek histories seem contemporary with the people and events in the Roman history of his time.