Time travel as a means of creating historical divergences (Alternate Histories)

The period around World War II also saw the publication of the time travel novel Lest Darkness Fall by L. Sprague de Camp, in which an American academic travels to Italy at the time of the Byzantine invasion of the Ostrogoths. De Camp’s time traveler, Martin Padway, is depicted as making permanent historical changes and implicitly forming a new time branch, thereby making the work an alternate history.