Not 4 sentences, but if this topic interests you, this is a good read: https://en.wikipedia.org/wiki/Lest_Darkness_Fall https://en.wikipedia.org/wiki/Lest_Dark

Not 4 sentences, but if this topic interests you, this is a good read: https://en.wikipedia.org/wiki/Lest_Darkness_Fall https://en.wikipedia.org/wiki/Lest_Darkness_Fall American archaeologist Martin Padway is visiting the Pantheon in Rome in 1938. A thunderstorm arrives, lightning cracks, and he finds himself transported to Rome in the year 535 AD. At this time, the Italian Peninsula is under the rule of the Kingdom of the Ostrogoths...Padway initially wonders whether he is dreaming or delusional, but he quickly accepts his fate and sets out to survive...He can speak both modern Italian and Classical Latin, and quickly learns enough Vulgar Latin (which was spoken at that time) to communicate effectively. Most crucially, Padway has read with great attention the book of the historian Procopius, who described the very war at whose outset Padway finds himself.